Installation method of door leaf positioning and sealing device of civil air defense door

The invention provides an installation method for a door leaf positioning and sealing device of a civil air defense door, and the installation method comprises the steps that an auxiliary tool is used, the auxiliary tool comprises a tool lower frame, a tool left frame, a tool upper frame and a tool right frame, and the four frames are welded into a rectangle matched with the door leaf sealing device; an upper sealing plate and a lower sealing plate are arranged on the tool left frame or the tool right frame; the tool frame and the sealing plate are fixedly connected with the door leaf sealing device through fixing bolts. The tool left frame, the tool upper frame and the tool right frame are further provided with tool disassembling nuts, the tool disassembling nuts are welded to the frames, through holes are formed in the positions, corresponding to the tool disassembling nuts, of the frames, and tool disassembling bolts matched with the tool disassembling nuts can penetrate through the through holes. The inst