Abstract: Aiming at the hidden danger of electrical leakage of household appliances, an intelligent anti-shock system based on 51 single chip microcomputer is designed. The system is composed of the smallest single chip microcomputer system, LCD1602 LCD screen, buzzer, temperature acquisition module, power button and relay module. When the system is connected to the electrical appliance, if there is any electrical leakage, the single chip microcomputer will be powered. It can effectively prevent the harm caused by leakage to the human body.