The invention discloses a gas meter measuring room shell pressing and installing combining method. The gas meter measuring room shell pressing and installing combining method is used for combining a measuring room shell body and a measuring room cover to form a measuring room shell combined body on pressing and installing combining assembly line. The gas meter measuring room shell pressing and installing combining method comprises the following steps that the measuring room shell body is installed and fixed on a follow fixture, first surface automatic gluing is conducted through a gluing machine, a first surface measuring room cover is pressed and installed through a cover pressing machine, a overturning mechanism overturns a fixture combined body by 180 degrees, second surface automatic gluing is conducted through the gluing machine, a second surface measuring room cover is pressed and installed through the cover pressing machine to form the measuring room shell combined body, detaching and disassembling are conducted on the follow fixture and the measuring room shell combined body on a detaching working station, and the follow fixture is returned to a shell body installing working station. The gas meter measuring room shell pressing and installing combining method has the beneficial effects that automatic gluing and cover pressing are achieved through the follow fixture and assembly line equipment, the labor intensity of the method is low, the producing efficiency is high, and the quality assurance capacity is high.