The invention discloses a producing and manufacturing process and equipment for a breather valve. An operator firstly manually mounts an O-shaped ring and a locking nut of a breather valve constituentpart on the lower part of a breather valve main body to form a semi-finished product; then, the semi-finished product breather valve main body is placed on a reciprocating conveying mechanism; an operator places an elastic composite gas-permeable membrane into the semi-finished product breather valve main body; the reciprocating conveying mechanism conveys the semi-finished product breather valvemain body to a position below a capping machine to stay for 1-3 seconds, and the capping machine acts within the time range; and a pressure head on the capping machine is utilized for compacting andflattening the elastic composite membrane inside the breather valve main body. The producing and manufacturing process can realize automatic assembly of the breather valve, sequentially performs compacting and flattening of the breather valve, and automatic screwing-in and unloading of the valve cover, is clear in motion route, is convenient in assembly, can continuously realize assembly operationfor the breather valve, reduces investment of labour during assembly of the breather valve, and improves production efficiency of the breather valve.