The invention discloses a power supply control system and a power supply control method for charging piles of electric automobiles based on remote cost-controlled intelligent electric meters. The power supply control system comprises a power transmission and distribution line, the remote cost-controlled intelligent electric meters are connected to the power transmission and distribution line in parallel, and a meter-controlled load switch, an earth leakage protection switch, a current-limiting air switch and the charging pile of the corresponding electric automobile are successively connectedto each remote cost-controlled intelligent electric meter. The power supply control system also comprises a cost-controlled intelligent electric meter communication and control system and an ordered charge control module. The ordered charge control module sends switch-on and switch-off control commands to the cost-controlled intelligent electric meters by the cost-controlled intelligent electric meter communication and control system based on a control policy customized by a power supply enterprise so as to control on-off of the meter-controlled load switches to supply power to the charging piles of the electric automobiles or not. According to the power supply control system, the utilization ratio of an existing power supply facility is improved, and reformation of capacity expansion on alarge scale is avoided, and the charging demands of electric automobile users can be also met to the maximum extent.