A torque adjustment switching structure of a torque wrench is characterized by: a screw hole seat, which is located in the rear section of the torque wrench extension shank; the axial actuating sleeve can be axially advanced and retracted; the rear pull sleeve can be forced against the axial actuating sleeve. The axial movement and the rotary motion: the clutch member has a snapping mode and a disengagement mode with the sliding forward and backward of the backward pulling sleeve; and the rearward pulling sleeve presents a force for axial advance and retreat with respect to a screw, and rotates. The timing mechanism is configured to drive the synchronous rotation of the screw. The limiting member is disposed at a corresponding portion of the screw and the rear sliding sleeve to generate a limiting force for the axial backward sliding state of the backward pulling sleeve.