The invention discloses a charging management method of an electric vehicle. The charging management method comprises following steps of 1) arranging multiple electric vehicle charging devices; 2) detecting electric quantity of a battery of the electric vehicle when the electric vehicle enters a parking lot; and 3) charging the electric vehicle when the electric quantity of the battery of the electric vehicle is lower than the set value so as tokeep the battery of the electric vehicle in a frequently-charged and slowly-discharged state. By timely detecting and monitoring rest electric quantity of the electric vehicle, the electric vehicle is timely charged when the rest electric quantity of the electric vehicle is lower than the set value and the battery of the electric vehicle is kept in the frequently-charged and slowly-discharged state, so service lifetime of the battery of the electric vehicle is effectively extended.