The invention relates to an assembly type gas meter box prefabricated clamping and pressing connection assembly which comprises two meter boxes to twelve meter boxes. The prefabricated clamping and pressing connecting assembly matched with the gas meter box body is composed of a gas main pipeline, a first gas branch pipeline, a second gas branch pipeline, a third gas branch pipeline, a fourth gas branch pipeline, a fifth gas branch pipeline, a sixth gas branch pipeline, a pipeline fixing device and a gas meter. According to the fabricated gas meter box, a left-in-left-out structure, a left-in-right-out structure, a right-in-left-out structure or a right-in-right-out structure is customized according to clients, the construction efficiency is improved, the installation difficulty is reduced, the gas main pipeline, the gas flow dividing pipe assembly and the loose joint type flow stabilizing pipeline are all prefabricated parts, factory assembly line work is achieved, compared with the prior art, the working efficiency is improved by more than 50%, and the cost is reduced. The production cost is reduced by more than 35%, on-site welding and wire twisting are not needed, connection nodes and leakage points are reduced, the leakage problem of the joint in the gas meter is effectively controlled, the market prospect is wide, and the economic benefit is remarkable.