The invention relates to a digital management system and method, belongs to the field of numerical control, and specifically relates to a digital management system and method for hydraulic wrenches. The system comprises a parameter selection model and a wrench starting module, wherein the parameter selection module is used for selecting a nut, intensity and a wrench type, automatically generatinga locking torque and a pressure value as well as a loose torque and a pressure value via an embedded program from a built-in conversion table, taking the values as important conditions of fuzzy control, and displaying the values on a page so as to supply references for users; and the wrench starting module is used for starting a wrench to work according to a preset torque after selecting a good working condition, acquiring and monitoring a working state of the wrench in real time and automatically stopping the work of the wrench when a fuzzy control condition is achieved. The system and methodhave the advantages of well using equipment through setting common options and improving the usability and safety of the equipment to a great extent.