The invention discloses a fixing device for constraining the body position of a cerebral palsy child. The fixing device comprises a fixed base, a cushion plate, a lower limb blocking cover, a lower limb air cushion, a connecting plate, a backup plate, a sliding groove, a first bolt, a spring, a push plate, a fixing plate, side plates, a head air cushion, a fixing sleeve, a second bolt, a universalball head and a supporting frame. According to the fixing device for constraining the body position of the cerebral palsy child, firstly, through soft contact four-limb constraint design, the four limbs of the cerebral palsy child can be effectively limited, soft contact can be further achieved, and the comfort of the four limbs of the child is improved,; secondly, through the cooperative effectof head adjusting and limiting structures, the head posture of the cerebral palsy child can be limited, then following feeding is convenient, and the clinical practicality is improved; in addition, asthe universal ball head mechanism is arranged in the fixing device, effective movement of the upper limbs of the child with high muscular tension can be achieved, finally convenience and high efficiency of nursing of the cerebral palsy child are greatly improved, the operating burden on nursing staff is also relieved, and the good application and popularization purpose is achieved.