Trolley capable of adjusting length of push rod

The utility model discloses a trolley capable of adjusting the length of a push rod, and relates to the field of transportation tools. The height adjusting device comprises a bottom plate, the top of the bottom plate is provided with an overturning plate, a baffle and a handle assembly, the handle assembly comprises a fixing rod and a fixing cylinder, a connecting box is fixed to the inner side of the fixing cylinder, and a positioning groove is formed in the inner side of the fixing rod. When the height is adjusted to a proper position, the worker reversely rotates a connecting shaft, the connecting shaft drives the gear to reversely rotate, the gear rotates, the two sets of toothed bars oppositely move, then the other ends of the toothed bars are separated from the positioning grooves, and then the worker can adjust the height of the fixing cylinder; therefore, the other end of the toothed bar is inserted into the positioning groove, and the problem that the length of a handle of the trolley cannot be adjus