The invention discloses a leg rehabilitation bed. The leg rehabilitation bed includes a bed body. The middle part of a top plate of the bed body is provided with a moving through groove. A horizontalmoving plate is located directly above the top plate of the bed body. A vertical moving block is fixed to the bottom surface of the middle part of the horizontal moving plate. The bottom end of the vertical moving block extends downward out of the moving through groove. Connecting plates are fixed to the bottom surface of the top plate of the bed body at the front and rear parts of the moving through groove. The two ends of a transverse screw rod are hinged to the two connecting plates. A driving motor is fixed to the outer sidewall of one of the connecting plates. The output shaft of the driving motor is a spline shaft. The output shaft of the driving motor is sleeved by a splined hole arranged in one end of the screw rod. The rear part of the top plate of the bed body is provided with atelescopic through hole. A supporting frame is fixed to the bottom surface of the top plate of the bed body. A telescoping motor is fixed to the bottom surface of a bottom plate of the supporting frame. The bed enables rehabilitation with a certain degree of recovery to carry out independent rehabilitation exercise of legs without the help of medical staff, is good in effect, and can reduce occupation time of the medical staff.