A motor housing is made metal titanium and calendar formed by stamping process by using titanium. The motor housing is of a barrel structure, and the barrel wall and bottom are integrally stamped and formed. The other end of the barrel is provided with a barrel cover; rim of the barrel cover is embedded into the stepped groove on the inside of the barrel wall; and the barrel bottom and the barrel cover form a symmetrical structure. The motor housing is a thin-walled housing structure, and the barrel wall is a circular bushing. The barrel bottom and barrel cover are respectively provided with two sections of outward protruding concentric bosses; the barrel bottom and barrel cover are also respectively provided with shaft holes; and fillet connection is provided between the concentric bosses as well as between the concentric boss and the barrel wall.