The invention provides a machine tool electrical fault diagnosis system. The system comprises an integrated control cabinet, a controller and a display; the integrated control cabinet comprises an FPGA integrated circuit board as well as connection ports and a data register which are integrated on the FPGA integrated circuit board, wherein the connection ports are connected with electrical devices, and the data register is used for storing the status signals of the connection ports; the controller reads the status signals of the connection ports from the data register, and performs analysis judgment on the read status signals to determine the statuses of the connection ports; and the display includes a UI display interface which correspondingly displays the statuses of the connection ports, wherein the statuses of the connection ports are determined according to the controller. According to the machine tool electrical fault diagnosis system of the invention, the plurality of connectionports connected with the electrical devices are provided through the integrated control cabinet, and the status signals of the connection ports can be stored; the fault information of the electricaldevices can be determined through the UI interface; and therefore, troubleshooting time can be shortened, and working efficiency can be improved.