The invention discloses a control circuit and a control method for an internet intelligent AC charging pile, and belongs to the field of electric car charging piles. The control circuit comprises a lightning protection circuit, a power supply circuit, an electric energy metering circuit, a relay, a charging gun, a CPU circuit, an on-off input, an on-off output, a connection detection circuit, an RS485 interface, an Ethernet interface and a GPRS module, wherein a monitoring pin of the lightning protection circuit is connected with a resistor and a diode in series and is isolated with an optocoupler; a signal enters a CPU; one path of output of the electric energy metering circuit is connected with the CPU through a serial port; the on-off input is connected with the CPU; the CPU is connected with the RS485 interface, the Ethernet interface, the GPRS module, the relay and the on-off output respectively; and one path of output of the CPU is connected with the charging gun through the connection detection circuit. A modular design of the original charging pile is changed into an integrated design, so that the material cost and the production cost are reduced; and the reliability is improved. A leakage current is measured in real time; a background management system can know cable insulation in advance; and an electric shock hazard is avoided.