The invention relates to a processing mould of an automobile brake gear. The mould is provided with a main mould tooth cutting mould and abuts against the inner middle part of a main mould shell at the tail end of the main mould tooth cutting mould through a disk spring. The invention also relates to a processing method of the automobile brake gear. A product is obtained by cold heading processingand through one-time formation. Compared with the prior art, the processing mould and the processing method of the automobile brake gear have the following advantages: in the process of processing the automobile brake gear by the processing mould, gapless extruding cutting teeth are formed among a stamping mould, the product and the main mould when the stamping mould moves to a front dead point,so the section of the product is smoother and the tooth bottom does not have defects such as burrs; and the production efficiency is higher.