The invention belongs to the technical field of medical appliances, in particular to a body position fixator for pediatric surgical operation. The body position fixator comprises a supporting platformand a supporting frame. A bandage fixation mode of traditional operation is changed into a locking air bag fixation mode, on one hand, the problem that the position adjustment is inconvenient duringtraditional body position fixing is solved, on the other hand, a locking air bag has higher elasticity and flexibility, secondary injury to a patient due to too tight fixation by a high-hardness bandage is reduced, and therefore, the child patient is effectively protected; besides, fixed boxes are arranged on the supporting platform, and by cooperation of extrusion air bags, No.1 pistons and No.2pistons in the fixed boxes, the locking fixation effect of the locking air bag on the patient is enhanced and unsmooth operation caused by body movement when the patient is nervous or painful is reduced.