A vehicular alternating-current variable-frequency electric workover rig comprises a transfer portion and an operation portion. The transfer portion comprises a chassis, a plate-pushing clutch and a gearbox, the plate-pushing clutch is mounted on the chassis, and the operation portion comprises an electric control device, a variable-frequency motor, a gearbox, a winch assembly, a derrick, an operating room, a disc brake hydraulic system oil tank, a disc brake hydraulic system power source, a main hydraulic system oil tank and a gas circuit power source which are mounted on the chassis. The operation room and a cab are mounted at two ends of the chassis respectively, the winch assembly is connected with the gearbox, the variable-frequency motor, the electric control device, a chassis gearbox and a chassis engine sequentially, the main hydraulic system power source is connected with the winch assembly, a rear support and the derrick are mounted at one end of the chassis, a front support assembly is mounted at the front of the other end of the chassis, and the disc brake hydraulic system oil tank and the gas circuit power source are mounted on two sides of the middle of the chassis respectively. The vehicular alternating-current variable-frequency electric workover rig has the advantages of fine maneuverability, high safety, fastness in ascending and descending, high cross-country ability and the like, and can be widely applied to downhole operation engineering in oil fields.