The invention discloses an aided adjustment tool for a car door lock catch. The aided adjustment tool comprises a body. A car door inner panel binding face is arranged on one side of the body. A plurality of car door inner panel adsorption magnets are arranged on the car door inner panel binding face. A lock catch positioning hole is formed in the middle of the car door inner panel binding face. A door lock fish mouth clamping flanging is arranged on the edge of the lock catch positioning hole. The adsorption magnets are adsorbed at the car door inner panel door lock fish mouth position, the door lock fish mouth clamping flanging is matched with the door lock fish mouth, an assembler closes a car door once at relatively high speed, the Z-direction position and the Y-direction position of a lock catch are adjusted along with the adjusting tool through the lock catch positioning hole, the Z-direction position precision of the lock catch relative to a door lock is improved, and besides, the Y-direction surface difference between the lock catch and a surrounding part is ensured; and the auxiliary adjusting tool is used for aided adjustment of the car door lock catch position, the meshing accuracy of the door lock and the lock catch is improved, the door car closing sound quality is improved, the static locking force of the car door and the minimum closing velocity of the car door are ensured, and the door opening comfort is improved finally.