In order to reduce the negative impact of large-scale access of electric vehicle charging load on the safe and stable operation of the power grid, a Hotelling model based duopoly alliance pricing method for charging service fee is proposed to solve the problem of charging market competition pricing with multi-agent operator charging stations. Firstly, the respective interests of power grid companies, charging station operators and electric vehicle users in the multi-charge market are analyzed. Secondly, the Hotelling model is used to describe the distribution characteristics of charging demand guided by price, and a charging station operator charging service fee pricing scheme in the multi-active charging market is designed. Finally, the validity of the proposed pricing method for charging service fee duopoly alliance is verified by simulation analysis. This work is supported by Key Science and Technology Project of State Grid Corporation of China (No. 52110417001G).