The invention discloses a low limb movement training device after brain trauma surgery. The low limb movement training device after the brain trauma surgery comprises a rotating assembly and a pedal assembly, the rotating assembly comprises a rotating shaft, rotating handles, a hollow pipe and a pressure shaft, and the rotating shaft is located at one end of the pressure shaft and fixedly connected with the pressure shaft; return springs are placed in spring boxes, when a patient puts the feet on pedals, due to the fact that sliding grooves are formed in the upper surfaces of the pedals, footclamping boards and the pedals are connected through the sliding grooves in a sliding mode, then the feet of the patient are fixed, later on, when the patient stands on the pedals, the return springsstretch out and draw back to provide upward supporting force for the patient and assist the patient in movement, convenience is brought to a user, an arranged pressure sensing alarm raises the alarm when the patient is in danger, and a medical worker is informed in time to rescue the patient, so that the safety of patient training is improved.