Dust collection device of plate cutting machine

The utility model relates to a dust collection device of a plate cutting machine. Workbench, a cutting saw is installed on the workbench, a dust suction pipe is arranged above the cutting saw, one endof the dust suction pipe is communicated with a motor, the motor is communicated with a dust collection bag, a lifting device is installed on the workbench, a rotating shaft is rotatably connected tothe lifting device, the dust suction pipe is installed on the rotating shaft, and a fastener for fixing the rotating shaft and the lifting device is installed on the lifting device. Through the arrangement of the lifting device and the rotating shaft, in the working process of the cutting saw, chippings generated by friction between saw teeth of the cutting saw and a plate are sucked into the dust suction pipe by the dust suction pipe under the action of the motor; due to the lifting device, the pipe opening of the dust suction pipe can be adjusted at will according to different plates, and the dust suction pipe can b