Self-checking multifunctional isolation acquisition circuit, device and system

The invention provides a self-checking multifunctional isolation acquisition circuit, device and system. The self-checking multifunctional isolation acquisition circuit comprises a processor, an AD chip, a digital isolator, a protection circuit, an impact circuit, a self-checking circuit and a connector, the input end of the self-checking circuit is connected with the output end of the connector and the processor, and the self-checking circuit is used for external power supply, signal feedback and self-checking circuit control through the connector. The input end of the protection circuit is connected with the output end of the connector, and the protection circuit is used for preventing surge impact. The output end of the protection circuit is connected with the input end of the AD chip and the input end of the impact circuit, and the protection circuit and the impact circuit are used for inputting signals after surge filtering into the AD chip and eliminating an electric shock oxide layer of an external con