The invention provides a leg strength rehabilitation training device which comprises a top plate, a carrier plate, a spring, a lower suspension, a first gear, a second gear, a connecting plate and a pedal. The top plate is fixed to the front end face of the carrier plate, and the rear end of the spring is mounted on the front end face of the top plate. By means of the design, the knee joint and the ankle joint of a patient can be exercised at the recovery preliminary stage of the patient, the first gear is mounted on the lower suspension through a rotary shaft, the second gear is mounted on the left side of the connecting plate, and gear teeth of the first gear and gear teeth of the second gear are engaged. The connecting plate is arranged on the lower side of the first gear, the connecting plate is mounted on the lower suspension through a rotary shaft, and the pedal is mounted on the right side of the connecting plate through a rotary shaft. By means of the design, the patient can obtain leg training of proper strength at the recovery middle and later periods of the patient, the riding stability of the patient is improved, and the leg strength rehabilitation training device is convenient to use and operate, capable of meeting training needs of the patient at different recovery stages and high in reliability.