The invention belongs to the technical field of rail transit vehicle maintenance, and discloses a double-armed car lifting jack. The double-armed car lifting jack includes a frame, a moving plate arranged at the bottom of the frame, a lifting assembly sliding in the vertical direction of the frame, and a power assembly driving the lifting assembly to slide, the lifting assembly includes a supporting frame slidably moving in the vertical direction of the frame, a support connected to the outer side of the supporting frame and lifting frames symmetrically arranged on the front side of the support, and the lifting frames are fixedly installed on the support through mounting seats; the lifting frames are hinged to the mounting seats, rotating axes of the lifting frames are vertically arranged,supporting arms are horizontally arranged at the front ends of the lifting frames, the inner sides of the supporting arms are bevel parts; and the power assembly includes a main motor mounted on theupper part of the frame and a lead screw fixedly connected to an output shaft of the main motor on the same axis, the lead screw is vertically arranged in a through groove, and the lead screw is connected to the inner wall of the supporting frame in a threaded mode. The double-armed car lifting jack has the advantages of compact structure, reasonable layout, convenient operation, good stability and high safety.