The invention provides a safety protection method, system and device for a terminal device and a readable storage medium. The method comprises the steps that the terminal device is online, and the IPand device fingerprint information of the terminal device is acquired; comparing and judging the equipment fingerprint information corresponding to the IP with the equipment fingerprint information and the IP in a fingerprint reference library; if the equipment fingerprint information corresponding to the IP is matched with the equipment fingerprint information and the IP in a fingerprint reference library, judging that the identity of the terminal equipment is legal, and allowing the terminal equipment to access a power information network; If the equipment fingerprint information corresponding to the IP is not matched with the fingerprint information and the IP in the fingerprint reference library, adding the terminal equipment corresponding to the IP into a blacklist, blocking the equipment from surfing the Internet, and carrying out early warning. The network safety is further reinforced through a device fingerprint mode, illegal invasion and MAC counterfeit devices are discovered,the device fingerprint mode basically has no influence on the system performance, and a part of network penetration attacks can be resisted.