The invention discloses a bed lower limb rehabilitative training machine, which comprises a support, a driving mechanism, a sleeve, a connecting rod I, a connecting rod II, a connecting rod III, an actuator, a walking dolly and a base. The driving mechanism is arranged on the support and in key connection with the sleeve; the sleeve is connected with the connecting rod I through bolts; the connecting rod I and the connecting rod II are connected through a fitting bolt; the connecting rod II and the connecting rod III are connected through two hinge pins. The actuator comprises a stepping box, two adjustment structures, a steel plate and a vertical rod; the stepping box is connected with the adjustment structures through the hinge pins, and connected with the walking dolly through the fitting bolts; the two adjustment structures are connected through the fitting bolts. A rib in each adjustment structure is welded to the steel plate, and the vertical rod is arranged in a square opening in the steel plate. The actuator is respectively connected with the walking dolly and the base through the fitting bolts; the base comprises an adjustment structure and a walking dolly convex track. The bed lower limb rehabilitative training machine has the advantages that the structure is reasonable; the use is convenient; a large amount of labor power is saved; the amount of exercise of a patient can be effectively increased.