The invention discloses a frequency converting control method appropriate for a charging process of an electric automobile. The frequency converting control method appropriate for the charging process of the electric automobile includes the following steps of fitting a charging power curve in a controller of a battery charger of the electric automobile, and obtaining P 0, P max, P min, and deltaP according to the charging power curve; working out present charging power P d; determining a range which the charging power P d is within; outputting the present frequency conversion operation power P out and obtaining present switching frequency value; judging a range of the frequency conversion operation power P out, wherein the charging time quantum t1-t2 ends; judging a range of present charging power P d in the time quantum t1-t2; outputting present frequency conversion operation power P out and obtaining present switching frequency value; and finishing the charging process when value of the P d is less than charging-stopping power P min. The frequency converting control method appropriate for the charging process of the electric automobile reduces power loss of a system when the vehicle-mounted battery charger charges a storage battery, improves charging efficiency, reducing battery disturbance in the charging process, and improves stability and capacity of resisting disturbance of the system.