The invention relates to a cart, specifically relates to a front frame and rear frame-combined cart, and belongs to the technical field of the excavator manufacturing industry. The front frame and rear frame-combined cart comprises a supporting framework. A first adjustment base is fixed to the front of the supporting framework, a first vertical hydraulic jack is connected to the first adjustment base through a clamping mechanism, a second adjustment base and a third adjustment base are fixed to the left and right sides of the rear of the supporting framework, a second vertical hydraulic jack is connected to the second adjustment base through the clamping mechanism, a third vertical hydraulic jack is connected to the third adjustment base through the clamping mechanism, and the second adjustment base and the third adjustment base are connected into a whole through a cross bar. The front frame and rear frame-combined cart is simple, compact and reasonable in structure, and the three supporting points can be independently adjusted, thereby being convenient and labor-saving in operation; the position of an underframe can be horizontally and vertically adjusted along a track; the height of front and rear carts can be conveniently quickly adjusted, so that the front and rear carts can be docked well, the manpower is saved, and the safety and reliability of the assembly work are guaranteed.