The utility model relates to the technical field of gearbox respirators. The utility model relates to a respirator, in particular to a gearbox respirator seat. The device comprises a hollow rod part with two open ends, wherein the rod part sequentially comprises a respirator connecting part, a limiting part and a gearbox connecting part from top to bottom; the outer diameter of the upper portion of the gearbox connecting part is larger than that of the lower portion of the gearbox connecting part, first external threads are arranged on the outer wall of the gearbox connecting part, convex rings are arranged at the two ends of the limiting part, the outer diameter of the convex rings at the upper end of the limiting part is larger than that of the respirator connecting part, and the outer diameter of the convex rings at the lower end of the limiting part is larger than that of the gearbox connecting part. The connecting structure has the advantages that the respirator base is arranged to serve as a middle connecting bridge between the respirator and the gearbox, abrasion to a screw hole of the gearbox due to disassembly of the respirator is avoided, the service life of a gearbox body is prolonged, and the maintenance cost of a user is reduced.