The invention provides a leg curling auxiliary bed. The leg curling auxiliary bed includes a bed plate, a head position portion, crotch positioning pieces, and leg limiting pieces; the head positioning portion is arranged on the bed plate; the crotch positioning pieces are movably arranged the bed plate, and has an opened unlocked state and a locked state for positioning the crotch; and the leg limiting pieces are arranged on the bed plate and are used for limiting leg movement paths of a children patient during leg curling.