The invention provides an interface circuit supporting EPON, GPRS and CDMA communication modules, and an interface circuit control method, and relates to an interface circuit and an interface circuit control method, for solving problems that the EPON, GPRS and CDMA communication modules cannot exchange data at the same terminal due to lack of the interface circuit simultaneously supporting the EPON, GPRS and CDMA communication modules in the prior art. The provided interface circuit is formed by connecting a first resistor R85, a second resistor R89, a third resistor R93, a fourth resistor R102, a fifth resistor R92, a sixth resistor R86, a seventh resistor R90, a first triode V32, a second triode V36, a third triode V28, a fourth triode V33, a first capacitor C53, a second capacitor C54, a first chip V34 and a second chip V35. The interface circuit and interface circuit control method may be applied to the data exchange of the EPON, GPRS and CDMA communication modules at the terminal.