Extensible electrical stimulator with arbitrary wave output function

The utility model discloses an extensible electrical stimulator with an arbitrary wave output function. The extensible electrical stimulator comprises a storage module, a communication module, a master control module, a power supply module and a plurality of channel modules, wherein the storage module is connected with the main control module through an I2C bus or an SPI interface or an FSMC interface; the main control module is connected with the communication module through a USART serial port or an SPI interface; the main control module is connected with the channel module through an IO line or a USART serial port or an SPI interface. The communication module is connected with the channel module through an SPI interface or a USART serial port or an I2C bus. The power supply module is respectively connected with the storage module, the communication module, the main control module and the channel module through power lines; when the electrical stimulator hardware framework is used in cooperation with relate