The invention discloses a connecting and fixing mechanism for a tractor oil pump. The connecting and fixing mechanism comprises a face plate (1), a pair of middle connecting plates (7) and a pair of rear adjusting plates (8),wherein the middle connecting plates and the rear adjusting plates are sequentially and correspondingly arranged on the two sides of the face plate (1); the face plate (1) is square, and first long round adjusting fixing holes (6) are formed in the four corners of the face plate respectively; a second flat round fine adjustment hole (4) is formed in the center of the face plate (1), and long round fine adjustment fixing holes (5) are formed in the two sides of the second fine adjustment hole (4); a fine adjustment plate (2) is mounted on the face plate (1), and a first round fine adjustment hole (3) which corresponds to the second fine adjustment hole (4) in the face plate (1) is formed in the center of the fine adjustment plate (2). According to the connecting and fixing mechanism for the tractor oil pump, by means of the adjustable connecting mechanism, the connecting and fixing modes are adjustable, the connecting and fixing mechanism is applicable to fixing and connecting of tractor oil pumps of various specifications and models to hydraulic equipment, the cost is low, disassembly and assembly are convenient, and the production efficiency is substantially improved.