Construction waste screening machine

The utility model provides a construction waste screening machine, which relates to the technical field of screening machines, and comprises a main body, a movable groove is arranged in the main body, a mounting bracket is arranged in the movable groove, the mounting bracket is movably connected with the movable groove, a screen plate is arranged in the mounting bracket, the screen plate is connected with the mounting bracket in a clamping manner, and a connecting block is arranged on the side surface of the mounting bracket. A bidirectional screw rod is arranged in the main body and is in threaded connection with the connecting blocks, and the bidirectional screw rod enables the sieve plates to move relatively under the action of an adjusting motor, so that the sizes of sieve holes in the surfaces of the sieve plates can be adjusted, and construction wastes with different particle sizes can be sieved; and blocked construction wastes are easy to fall off, so that the screening efficiency of the screening mach