The invention discloses a vehicle steering and brake integrated spherical oil-and-air pump. When a piston (3) and a rotary table (5) swing around a center pin (4) relatively, a work chamber V1 (1001) and a work chamber V2 (1002) of which the volumes change alternately and a work chamber V3 (1003) and a work chamber V4 (1004) of which the volumes change alternately are formed in a spherical inner cavity; the work chamber V1 (1001) and the work chamber V2 (1002) are used as air pumps, the work chamber V3 (1003) and the work chamber V4 (1004) are used as oil pumps, and seals are arranged among a hydraulic oil circulation system, a compressed air circulation system and a lubrication oil circulation system, so that steering power-assisting hydraulic oil, compressed air and lubrication oil circulate independently. A steering oil pump and a brake air pump are integrated in one spherical pump, the structure of an existing steering and brake system of a diesel engine vehicle is simplified, the cost is reduced, and working efficiency is improved.