The 12V ESP8266 4 channel WIFI relay module uses ESP-01 as the WIFI module, and with the mature and stable 8-bit MCU chip, the wireless control of the four-way relay in the local area network can be realized by using the mobile phone APP in a simple configuration process. The configuration of the account number and password of the ESP-01 WIFI module can be completed on the mobile phone APP, and the configured account number and password have the function of power-off memory.