The invention discloses a shared charging method. Through sharing backup batteries, the backup batteries are charged by fully utilizing the leisure time of part of users and the charging station, thecharging achievement obtained by utilizing part of the leisure time is shared to users who in urgent need for power, and the method belongs to a citizen sharing type charging method, effectively overcomes the defects that the electric vehicle is poor in endurance, slow in charging and poor in use experience, and has great significances for comprehensive popularization of the electric vehicle.