With the rapid growth of clean energy installed capacity, the problem of clean energy consumption is becoming increasingly prominent. Power users are also faced with low-carbon transformation in the process of power consumption. This paper establishes a user carbon trading model considering the optimal social benefits under the environment of electricity carbon linkage. According to the carbon emission reduction needs of power customers, the power customers are divided according to the electricity behavior and basic information, and the benefit model of large users and distributed users participating in carbon trading is established. In this paper, through the improvement of the existing direct power purchase trading mode, the feasible mode of large users and distributed users participating in carbon trading is added, and the benefits of carbon trading are calculated. In the simulation of the example, the high-power centralized charging station of electric vehicle is used to simulate the large users, and the low-power AC community charging pile is used to simulate the distributed users, The energy efficiency of carbon trading is calculated under the condition of electric energy substitution.