The invention depends regular intervals on the front upper face portion of the base body portion, and a drive roller and a base plate that is installed to be rotated by receiving the driving force from the driving motor provided with plates inclined base at an angle is provided, the drive motor the rear of the base plate spacing the left and right driven roller is provided with the installed drive roller and the left and right driven roller, the surface preparative cylinder provided in the upper surface portion forward of the edge grinding unit, and a base plate which rotates the abrasive belt is gwinchwi are provided side of the preparative cylinder piston, the front if it is equipped with left and right straight line in the insertion edge chamfering blocks the connection groove is formed on while the chamfered blocks according to the preparative cylinder forward operation projecting the belt for grinding located between the left and right driven roller in front of the panel to be conveyed through the conveyance and chamfering operation part to cause contact with the side edges of the abrasive, to one side of the base plate By the connection pressure cylinder connected to the regulator as installed with the base plate abutting on the inner circumferential surface of the pressing contact portion, and the polishing belt to be supported pressed in to the control pressure constant at a front polished with a polishing belt and the panel for fixing. relates to an angle within a repeat operation as a seesaw type from the belt, it characterized in that the abrasive belt consists of a belt roller which causes the flow along the left and right drive roller and the driven roller in a vertical flow predetermined distance driven panel edge grinding device.