Abstract: Security of electrical intelligent sensors and sensor networks is still in the initial research stage, and resource constraints and lack of low-voltage power supply in most application sites make electrical intelligent sensors extremely sensitive to security costs. The widespread user-side deployment makes them more susceptible to physical attacks such as side channel attacks. Besides, new types of security attacks which utilize sensing mechanisms or data processing algorithms are also increasing. Firstly, we analyzed the security requirements of electrical intelligent sensors and networks based on site conditions, service characteristics, equipment capabilities, and industry status quo. And then we established a security technology framework, and reviewed the state-of-the-art research on the security technologies which the electrical intelligent sensors have special needs on, such as sensing security, storage security, lightweight encryption, identity authentication, code and firmware security. Finally, we proposed some development suggestions on the security technologies, which can be used to support the construction of the safe and reliable power database.