The invention provides a grid fault measuring and control device and relates to the technical field of circuit protection. The grid fault measuring and control device is characterized by comprising a signal input end, a signal collecting and processing module, a first singlechip, a second singlechip, a third singlechip, and a fourth singlechip, wherein the signal collecting and processing module is connected with the back side of the signal input side in an electric mode, the first singlechip, the second singlechip, the third singlechip, and the fourth singlechip are connected with the back side of the signal collecting and processing module, and the fourth singlechip is connected with a controlling keyboard module, a 485 communication transmission module, a memory module, a liquid crystal display (LCD) module and an indicator light module. The grid fault measuring and control device is modularized in design, compact in structure, advanced in technology, and capable of guaranteeing instantaneity and accuracy of calculating through a high-speed digital signal processor (DSP) nuclear processor. A multi-master controller area network (CAN) bus communication with the functions of self error correction and self arbitration is adopted among all modules, mass data is exchanged and shared, and the grid fault measuring and control device has the function of fault remembering. Liquid crystal display in Chinese is achieved, and the grid fault measuring and control device is clear in running status, capable of operating in menu-type , and convenient and easy to use.