Mechanical press machine with adjustable stroke

The invention relates to the technical field of press machines, in particular to a stroke-adjustable mechanical press machine. The rack is provided with a driving device, the driving device is connected with a reciprocating assembly, and the driving device is used for driving the reciprocating assembly to move; the stroke adjusting assembly is used for adjusting the motion stroke of the reciprocating assembly; and a belt adjusting assembly. According to the device, the stroke adjusting assembly is arranged, the piston rod of the lifting oil cylinder is controlled to extend or retract, the first transmission shaft and the crankshaft can be driven to move up and down through the lifting plate, the lower dead center of the pressure sliding block is adjusted, and the pressure capable of being generated by the device is kept unchanged; the sliding direction of the guide frame is limited through the guide column, locking and releasing of the guide frame and the guide column are achieved by arranging the hydraulic e