A network sharing system, comprising: an outdoor wireless transceiver device, comprising a high-frequency network transceiver module and a first Ethernet port, wherein the high-frequency network transceiver module is connected to the first Ethernet port and is configured to receive a high-frequency network signal, wherein the high-frequency network transceiver module is a 5G transceiver module, or a 802.11ax or 802.11ad transceiver module; an indoor network sharing device being arranged adjacent to the outdoor wireless transceiver device, the indoor network sharing device and the outdoor wireless transceiver device being respectively installed at two sides of a door or a window, and the indoor network sharing device comprising a processing module and a second Ethernet port, wherein the processing module is connected to the second Ethernet port, wherein the indoor network sharing device is a DSL modem, a gateway, or a router; and a high-speed Ethernet transmission cable, having a transmission rate above 1 giga bits per second (Gbps), wherein two ends of the high-speed Ethernet transmission cable are respectively connected to a first RJ45 connector and a second RJ45 connector, the high-speed Ethernet transmission cable is provided with at least one flat cable segment, the first RJ45 connector is connected to the first Ethernet port, and the second RJ45 connector is connected to the second Ethernet port, the high-speed Ethernet transmission cable is a flexible cable, and a thickness of the at least one flat cable segment is less than 4 mm, wherein the indoor network sharing device is further connected to a power supply, the power supply outputs a power signal, and the processing module receives the power signal and transmits the power signal to the outdoor wireless transceiver device through the high-speed Ethernet transmission cable, and wherein the indoor network sharing device is further provided with a nano tape, the nano tape is provided with a bonding surface and an absorption surface opposite to each other, and the bonding surface is fixedly disposed on a surface of the indoor network sharing device. an outdoor wireless transceiver device, comprising a high-frequency network transceiver module and a first Ethernet port, wherein the high-frequency network transceiver module is connected to the first Ethernet port and is configured to receive a high-frequency network signal, wherein the high-frequency network transceiver module is a 5G transceiver module, or a 802.11ax or 802.11ad transceiver module; an indoor network sharing device being arranged adjacent to the outdoor wireless transceiver device, the indoor network sharing device and the outdoor wireless transceiver device being respectively installed at two sides of a door or a window, and the indoor network sharing device comprising a processing module and a second Ethernet port, wherein the processing module is connected to the second Ethernet port, wherein the indoor network sharing device is a DSL modem, a gateway, or a router; and a high-speed Ethernet transmission cable, having a transmission rate above 1 giga bits per second (Gbps), wherein two ends of the high-speed Ethernet transmission cable are respectively connected to a first RJ45 connector and a second RJ45 connector, the high-speed Ethernet transmission cable is provided with at least one flat cable segment, the first RJ45 connector is connected to the first Ethernet port, and the second RJ45 connector is connected to the second Ethernet port, the high-speed Ethernet transmission cable is a flexible cable, and a thickness of the at least one flat cable segment is less than 4 mm, wherein the indoor network sharing device is further connected to a power supply, the power supply outputs a power signal, and the processing module receives the power signal and transmits the power signal to the outdoor wireless transceiver device through the high-speed Ethernet transmission cable, and wherein the indoor network sharing device is further provided with a nano tape, the nano tape is provided with a bonding surface and an absorption surface opposite to each other, and the bonding surface is fixedly disposed on a surface of the indoor network sharing device.