The invention belongs to the field of precise gear testing technology, and discloses a self-mounting-reference equal-common-normal-line gear involute template. The self-mounting-reference equal-common-normal-line involute template comprises a left tooth surface, a right tooth surface, an upper reference cylindrical surface, a lower reference cylindrical surface, an upper end surface, a lower end surface and a reference hole. The gear involute template satisfies a basic requirement for a grade-1 precise gear involute template in a gear involute template national standard. Furthermore the involutes of the left special-shaped tooth surface and the right special-shaped tooth surface of the template have a common normal line and a unified expanded basic circle arc. The self-mounting-reference equal-common-normal-line gear involute template facilitates subsequent ultra-precise processing and testing of the gear involute template. Furthermore, the self-mounting-reference is used for processing and measuring and is furthermore used as a magnitude transmission reference in use of the gear involute template. The measurement results of the structure tooth profile shape deviation ffalpha and atoth profile inclination deviation offset fHalpha are not closely related with the processing error and the mounting deviation error of a measuring core shaft in a use process, thereby ensuring highconvenience in use and high dimension stability in magnitude transmission.