The invention belongs to the technical field of irrigation and fertilization devices, and particularly relates to an automatic mobile irrigation and fertilization device for agricultural planting. Interms of the problems of simple structure, inconvenient use and poor irrigation effect of the irrigation and fertilization devices, the device includes a base, the top outer wall of the base is fixedto a water tank by a screw, the top outer wall of the water tank is fixed to an electric motor by a screw, the output shaft of the electric motor is connected with a stirring rod through a coupling, awater inlet hole is formed in the top outer wall of the side, near the electric motor, of the water tank, the inner wall of the water inlet hole is in inserting connection with a water inlet pipe, the top end of the water inlet pipe is sleeved with a water inlet hopper, and a feed hole is formed in the top outer wall of the other side, near the electric motor, of the water tank. The device has low intelligence degree, saves manpower and material resources, has good irrigation and fertilization effects, significantly improves agricultural production efficiency, saves a large amount of strength, has high automation degree, is convenient to use, and satisfies use requirements of people.