Mini-computer capable of being expanded to industrial control purpose

The mini-computer capable of being expanded into the industrial control purpose comprises a mini-host assembly and an industrial control expansion assembly, the mini-host assembly comprises a first mainboard, a CPU and a host expansion connection module, and the host expansion connection module comprises a host expansion data bus connector and a host expansion power connector. The industrial control expansion assembly comprises a second mainboard, a mechanical hard disk module and an industrial control expansion connection module, the mechanical hard disk module comprises a mechanical hard disk, an SATA data line socket and a hard disk SATA data line plug, and the industrial control expansion connection module comprises an industrial control expansion power supply connector and an industrial control expansion data bus connector. According to the application, the structure of the mini host assembly and the structure of the industrial control expansion assembly are designed, and the industrial control expansion