Multi-channel direct-current power supply control box

A multi-channel direct-current power supply control box comprises a machine box, a main control module and a plurality of power supply modules, the main control module and the power supply modules are arranged in the machine box, and the side wall of the machine box is provided with an input interface, an output interface and a communication interface. The power supply module is an AC/DC conversion power supply and is used for converting external 220V AC input by the input interface into + 24VDC and supplying the + 24VDC to tested equipment through the output interface; the main control module comprises a power supply circuit, an FPGA (Field Programmable Gate Array) and a relay control circuit, the power supply circuit is connected with the power supply module and the FPGA and is used for supplying power to the main control module after converting + 24VDC (Direct Current), the relay control circuit is connected between the power supply module and the output interface and is connected with the FPGA, and the FP