Intelligent hot standby redundant double network cards and hot standby redundant method

The invention discloses an intelligent hot standby redundant double network cards and a hot standby redundant method. For hardware, a single chip microcomputer is the core component, and receives interrupts through serial interfaces, and serial port data is acquired through a recommended standard (RS) 485 interface, an RS232 interface and a control area network (CAN) interface, is arranged in a transmission control protocol/transmission control protocol (TCP/UDP) message as network application layer data and then sent out through a network control circuit. Hot standby redundant seamless switching of double networks is supported, and externally shown are a media access control (MAC) address and an internet protocol (IP) address. When communication failure happens to some internet access, the internet access can be switched to a standby internet access in 20ms, a TCP/UDP protocol layer does not need to be rebuilt, and network data can be directly received and transmitted. The intelligent hot standby redundant double network cards can be conveniently installed in a case of electrical equipment in an embedded mode, and software and hardware do not need to be modified at all to support an Ethernet protocol.