Single-doping and multi-doping change-over switch for preparing nano SiO2 high-strength recycled concrete

The utility model belongs to the technical field of recycled concrete, and discloses a single-doping and multi-doping change-over switch for preparing nano SiO2 high-strength recycled concrete, which comprises a switch state switching structure, the switch state switching structure comprises a switch, the switch is electrically connected through an external power supply, the switch state switching structure further comprises an operation main body and a limiting main body, and the operation main body is electrically connected with the limiting main body. The operating main body slidably penetrates through the switch and is inserted into the limiting main body, the operating main body comprises a plug, a spring and a connecting sleeve, the plug is sleeved with the spring, the upper end of the spring is fixedly connected to the outer end of the switch, and the plug penetrates through the switch and is inserted into the limiting main body in a sliding mode; the lower end of the spring is fixedly connected to the