The invention discloses a car door installation tool for simulating a car side impact test, which comprises an upper frame, an upper hinged seat, a cross rocker, a lower hinged seat and a lower frame. Mounting plates are installed at the upper and lower ends of the upper frame. A guide rod is installed, one end of the guide rod is installed with a welding block, one end of the guide rod is provided with a boss, the other end is provided with a thread, and a nut is installed on the thread, the guide rod passes through the cross rocker, the cross rocker and the upper hinge seat connection, the guide rod can slide up and down in the cross rocker, and the cross rocker can rotate around the upper hinge seat; the welding block is provided with a through hole, and a shaft is installed in the through hole, and the shaft is installed on the mounting block. At the same time, it is connected with the lower frame, the lower frame rotates around the axis, and the lower end of the lower frame is hinged with the lower hinge seat at the same time. The test trolley of the invention improves the simulation effect of the automobile side impact test, can accurately simulate the impact conditions of different parts of the dummy during the side impact, and reduces the test cost.