Preassembly garage door

The invention relates to a preassembly garage door. The preassembly garage door comprises two guide rail frames mounted on the two sides of a door frame, an arc-shaped rail is formed at a bent position of each guide rail frame, and multiple door planks are connected through hinges and then fixed between the two guide rail frames in a limiting manner. Rolling wheels are rotationally arranged at the two ends of each door plank in the length direction. The rolling wheels are arranged in rolling wheel grooves in the corresponding guide rail frames. A transmission chain box is arranged above the straight part of each guide frame. A door opening machine is arranged at the end of each transmission chain box. A pull rod of each door opening machine is connected with the adjacent door plank. A tension spring is arranged on the lower portion of a channel of each guide rail frame. The preassembly garage door is simple and reasonable in structure, due to the fact that the modular assembly design is adopted, in the ocean export operating process, the preassembly garbage door is convenient to disassemble, quick encasement work of containers can be achieved, and transportation is facilitated. After the preassembly garage door arrives at the destination and is purchased by a customer, quick assembly work can be achieved quickly without the guidance of professionals.