Corner grinding device for demoulded cement product

The utility model relates to the technical field of building construction accessory devices, in particular to a corner coping device for demoulded cement products, which comprises a bottom plate, a corner coping device and a corner coping device, the reciprocating polishing assembly is mounted on the bottom plate and used for polishing the corners of the hollow bricks; the two rotary clamping assemblies are installed on the bottom plate, distributed oppositely and synchronously move in the opposite direction or the back-to-back direction, each rotary clamping assembly further comprises a sliding base, a moving plate is fixedly arranged on each sliding base, a rotating shaft is rotationally arranged on each moving plate, a circular plate is coaxially and fixedly arranged at the end, back to the moving plate, of each rotating shaft, and the circular plates are arranged on the rotating shafts. A clamping block is coaxially and fixedly arranged at the end, back on to the rotating shaft, of the circular plate. Acc