With the advancement of sensing technology and the miniaturization of sensors

the Internet of Things（IoT）technology has been rapidly developed in the power system. Due to the large number

extensive interconnection

and decentralized distribution of the power distribution IoT terminals

they have jumped out of the scope of border security protection

which has caused the terminals to become the main target and springboard for attacking the power grid. Firstly

combined with the power IoT architecture

the terminal security challenges are summarized from the aspects of software

hardware

communication

etc.

the terminal risk characteristics are further summarized

and the protection mechanism deployed to deal with the terminal risk is analyzed and its shortcomings are presented. Then

according to the existing protection vulnerabilities

the terminal security issues are analyzed

the encryption and authentication issues

data privacy security

time synchronization attack

malicious base station attack are focused on

and the communication block attack of 230 MHz power IoT terminal and their corresponding protection research are reviewed. Finally

the applications of new generation AI technologies such as deep learning in the security of IoT terminals are reviewed and prospected.