A power supply method carried out by a reverse power supply device connected between an optical access equipment and a home network terminal, comprising: detecting a working state of the home network terminal, wherein the home network terminal accesses the home network through a coaxial cable; characterized in that the method further comprises: controlling power supply to the optical access equipment according to the working state, wherein the optical access equipment is arranged to implement access of a passive optical fiber network to the home network, wherein the working state comprises at least one of the following: power-on of the terminal, registration of the terminal, dormancy of the terminal and power-off of the terminal, when the working state indicates power-on of the terminal or registration of the terminal, controlling power supply to the optical access equipment according to the working state comprises: starting power supply to the optical access equipment; and when the working state indicates dormancy of the terminal or power-off of the terminal, controlling power supply to the optical access equipment according to the working state comprises: terminating power supply to the optical access equipment. detecting a working state of the home network terminal, wherein the home network terminal accesses the home network through a coaxial cable; characterized in that the method further comprises: controlling power supply to the optical access equipment according to the working state, wherein the optical access equipment is arranged to implement access of a passive optical fiber network to the home network, wherein the working state comprises at least one of the following: power-on of the terminal, registration of the terminal, dormancy of the terminal and power-off of the terminal, when the working state indicates power-on of the terminal or registration of the terminal, controlling power supply to the optical access equipment according to the working state comprises: starting power supply to the optical access equipment; and when the working state indicates dormancy of the terminal or power-off of the terminal, controlling power supply to the optical access equipment according to the working state comprises: terminating power supply to the optical access equipment. controlling power supply to the optical access equipment according to the working state, wherein the optical access equipment is arranged to implement access of a passive optical fiber network to the home network, wherein the working state comprises at least one of the following: power-on of the terminal, registration of the terminal, dormancy of the terminal and power-off of the terminal, when the working state indicates power-on of the terminal or registration of the terminal, controlling power supply to the optical access equipment according to the working state comprises: starting power supply to the optical access equipment; and when the working state indicates dormancy of the terminal or power-off of the terminal, controlling power supply to the optical access equipment according to the working state comprises: terminating power supply to the optical access equipment.