A trolley of a crane is disclosed, which is provided with a main lifting mechanism, an auxiliary lifting mechanism, a trolley travelling mechanism, a trolley frame, a main lifting hook assembly and an auxiliary lifting hook assembly, wherein the main lifting mechanism, the auxiliary lifting mechanism and the trolley travelling mechanism are all mounted on the trolley frame; the trolley frame is composed of a main frame and an auxiliary frame; and the trolley travelling mechanism is provided with a speed reducer, a brake and a motor, wherein the speed reducer, the brake and the motor are connected integrally through a coupler and the integrated body lies on the platform of the main platform. The trolley of the crane reduces the sizes and the manufacturing cost of a vehicle body and a vehicle track, and simultaneously reduces the center of gravity of the trolley travelling mechanism, so that the operation is more stable; and the trolley of the crane has the advantages of convenient repair and replacement, low dead weight, low wheel pressure and reliable performance.