Stretcher rotation prevention device used in helicopter hoisting process

The invention discloses a stretcher rotation prevention device for a helicopter hoisting process, the stretcher rotation prevention device comprises a first-aid stretcher, a hoisting structure is connected to the first-aid stretcher, the hoisting structure comprises a hoisting frame, a central column, a hoisting ring, a main hoisting cable and a locking sleeve, and the locking sleeve is in sliding connection with the central column. Through the locking sleeve arranged on the hoisting structure, when the hoisting structure is used for hoisting the emergency stretcher, the top end of the locking sleeve can slide downwards along the central column by pulling the pull rope downwards, so that convex teeth located at the top end of the locking sleeve can be separated from tooth grooves located in the bottom surface of the fixed seat; therefore, the main sling with torsion can drive the hanging ring to rotate at the top end of the central column, the torsion generated when the main sling is tightened is eliminated,