A distal femoral condyle bone defect osteotomy positioner, comprising a distal femur bone defect osteotomy module, a sliding locking positioning module and a distal femur valgus angle positioning module, wherein a front side of the bottom of the distal femur bone defect osteotomy module is provided with an installation surface matching femoral anterior condyle; the sliding locking positioning module is connected behind the distal femur bone defect osteotomy module and comprises a sliding locking positioning module body the distal femur valgus angle positioning module is arranged under the sliding locking positioning module, including a distal femur valgus angle positioning module body, a valgus angle positioning sleeve, a valgus angle dial and a valgus angle toggle lever;; the front end of the valgus angle toggle lever is inserted into and fixed with the distal femur valgus angle positioning module body, and the rear end of the valgus angle toggle lever extends out from the rear of the distal femur valgus angle positioning module body and is sleeved with the valgus angle positioning sleeve, and the rear part of the valgus angle positioning sleeve is limited by a fixed nut screwed with the valgus angle toggle lever; the valgus angle dial is arranged above the valgus angle dialtoggle lever and is rotationally connected with the distal femur valgus angle positioning module body, the rear end of the valgus angle dial is an arc edge, the center of the arc edge is a 0° dial point, the axis of a fastening screw, the axis of a rotating shaft and the 0° dial point are positioned on a same vertical surface, a 3° dial point, a 5° dial point, a 7° dial point and a 9° dial point on the L side are arranged in sequence from the 0° dial point to the left, and a 3° dial point, a 5° dial point, a 7° dial point and a 9° dial point on the R side are arranged in sequence to the right; the arc edge is provided with a dial groove respectively corresponding to the 0° dial point, the 3° dial point, the 5° dial point, the 7° dial point and the 9° dial point on the L side and the 0° dial point, the 3° dial point, the 5° dial point, the 7° dial point and the 9° dial point on the R side, and the front end of the valgus angle positioning sleeve is provided with a convex positioning tip which is inserted into the dial groove; characterised in that a rear side of the top of the distal femur bone defect osteotomy module is provided with three correction osteotomy grooves which are arranged in parallel in the anteroposterior direction; and in that the sliding locking positioning module comprises a press-type locking hook, a middle part of the press-type locking hook is rotationally connected with the top of the sliding locking positioning module body, a spring is arranged between a lower part of the rear end of the press-type locking hook and the sliding locking positioning module body, and the front end of the press-type locking hook is a hook which can be detachably hooked with the correction osteotomy grooves. the sliding locking positioning module is connected behind the distal femur bone defect osteotomy module and comprises a sliding locking positioning module body the distal femur valgus angle positioning module is arranged under the sliding locking positioning module, including a distal femur valgus angle positioning module body, a valgus angle positioning sleeve, a valgus angle dial and a valgus angle toggle lever;; the front end of the valgus angle toggle lever is inserted into and fixed with the distal femur valgus angle positioning module body, and the rear end of the valgus angle toggle lever extends out from the rear of the distal femur valgus angle positioning module body and is sleeved with the valgus angle positioning sleeve, and the rear part of the valgus angle positioning sleeve is limited by a fixed nut screwed with the valgus angle toggle lever; the valgus angle dial is arranged above the valgus angle dialtoggle lever and is rotationally connected with the distal femur valgus angle positioning module body, the rear end of the valgus angle dial is an arc edge, the center of the arc edge is a 0° dial point, the axis of a fastening screw, the axis of a rotating shaft and the 0° dial point are positioned on a same vertical surface, a 3° dial point, a 5° dial point, a 7° dial point and a 9° dial point on the L side are arranged in sequence from the 0° dial point to the left, and a 3° dial point, a 5° dial point, a 7° dial point and a 9° dial point on the R side are arranged in sequence to the right; the arc edge is provided with a dial groove respectively corresponding to the 0° dial point, the 3° dial point, the 5° dial point, the 7° dial point and the 9° dial point on the L side and the 0° dial point, the 3° dial point, the 5° dial point, the 7° dial point and the 9° dial point on the R side, and the front end of the valgus angle positioning sleeve is provided with a convex positioning tip which is inserted into the dial groove; characterised in that a rear side of the top of the distal femur bone defect osteotomy module is provided with three correction osteotomy grooves which are arranged in parallel in the anteroposterior direction; and in that