The replaceable head digital display torque wrench are different from the general torque wrench, in which the ratchet wheel of the replaceable head wrench can be freely replaced with plug-ins such as opening mouth, plum blossom head and movable opening head. Both have powerful operation functions, including torque setting, unit setting, numerical storage, numerical clearance, as well as numerical output and user correction function. It is characterized by high precision, accurate measurement, stable performance, low power consumption and simple operation. The requirements for operators are reduced by installing digital display screens. It is applicable to bolt fastening and control in automobile industry, machinery industry, etc.