Milling cutter type pavement crack expanding device

The utility model discloses a milling cutter type pavement crack expanding device which comprises a movable supporting platform, a handrail assembly, an adjusting seat plate, an engine, a lifting mechanism, a right-angle reverser and a milling cutter, one end of the adjusting seat plate is hinged to one end of the movable supporting platform, the lifting mechanism can drive the adjusting seat plate to swing up and down around a hinge shaft, the other end of the movable supporting platform is fixedly connected with the lower portion of the handrail assembly, and the right-angle reverser is fixed to the other end of the adjusting seat plate. The engine is arranged on the adjusting seat plate and is in transmission connection with the right-angle reverser; and the milling cutter head is vertically arranged and is arranged on an output shaft of the right-angle reverser through a clamp. When the pavement crack expanding construction is carried out, the handrail assembly is pushed by hand to enable the device to mo