1. Drum sawing machine is composed of a frame, a power mechanism and a sawing machine, wherein the sawing mechanism is fixedly connected to the frame, and the power mechanism is installed on the frame and connected with the sawing mechanism; The edge sawing mechanism is composed of a wall panel support, a conveying system and a saw edge device; the wall panel support is fixedly installed on the frame, and rectangular holes are symmetrically opened on the front and rear wall panels of the wall panel support; The conveying system is at least two pairs of rollers, and each pair of rollers is installed in the rectangular hole of the wall panel bracket in a vertical distribution. The upper roller is mounted on the upper end of the rectangular hole of the wall plate bracket through the screw nut connected with the bearing, and a spring is installed between the bearing and the upper arm of the rectangular hole of the wall plate bracket; The lower roller is locked on the lower end of the rectangular hole of the wall panel bracket through the fixed buckle fixed on the bearing; the power mechanism is connected with a roller through a chain. A transmission gear is installed on the roller bearing of the conveying system, a bridge gear is installed in the middle of the rear wall panel of the wall panel bracket, and the upper and lower bridge gears are connected by intermeshing gears; The two adjacent upper drums are connected to each other through the transmission gear, the bridge gear and the chain, and the two adjacent lower drums are also connected to each other through the transmission gear, the bridge gear and the chain; The saw edge device is composed of a pressing wheel box, a saw blade box, a pressing wheel, a table board and a saw machine. The pressing wheel box is fixedly connected to the wallboard bracket through the steel plate, and the saw blade box is fixedly connected to the frame. The pressing wheel box and the saw blade box are combined to form an integral box, and the table plate is hinged on the top of the saw blade box. The pressing wheel is connected with the upper wall of the pressing wheel box through the bolts sleeved on the spring, and is pressed on the platen, and the platen is provided with a small groove. The saw machine is installed at the bottom of the saw blade box, and the upper blade of the saw blade of the saw machine protrudes to the top of the table through the small groove. The drum is stepped, and the diameter of the steps at both ends of the drum is not smaller than the diameter of the steps in the middle part. 2. Such kind of drum type saw edge machine according to claim 1 is characterized in that: The wall panel support (31) is an integral frame structure. 3. Such kind of drum type saw edge machine according to claim 1 is characterized in that: On the wall plate bracket (31), the bolt holes for connecting with the lower roller (321) are oval or rectangular holes, and the lower roller (321) can be adjusted in position in the horizontal direction. 4. Such kind of drum type saw edge machine according to claim 1 is characterized in that: The upper and lower walls of the edge sawing device (33) are provided with holes.