The invention discloses a hydraulic jack with an automatic speed regulation function and belongs to the technical field of hoisting equipment. The hydraulic jack comprises base, a pump body, a pump core, an oil pump pedal assembly, an oil cylinder, a jacket, a top cap, a piston rod assembly and a piston. An oil storage cavity is formed between the oil cylinder and the jacket, and an oil cylinder cavity is formed between the lower end of the piston and the base in the oil cylinder. The hydraulic jack is characterized in that the base is also provided with a slow oil return line, a rapid oil return valve structure and a hydraulic control one-way valve structure. The hydraulic jack can go down at a normal speed when in no load or light load, and slowly goes down when bearing a higher load, and therefore, the safety of use can be ensured, and the work efficiency is ensured. When the piston rod assembly is pulled out, hydraulic oil in the oil storage cavity enters the oil cylinder cavity by oil suction lines and oil suction one-way valve steel balls, and negative pressure cannot be formed after the hydraulic oil is supplemented into the oil cylinder cavity. After an external force is removed, the oil suction one-way valve steel balls are closed, and the piston rod assembly cannot be retracted into the oil cylinder. The hydraulic jack with the automatic speed regulation function is simple in structure and stable and reliable in performance, and is suitable for low-cost mass production.