A network sharing system includes an outdoor wireless transceiver device, an indoor network sharing device, and a high-speed Ethernet transmission cable. The outdoor wireless transceiver device includes a high-frequency network transceiver module and a first Ethernet port and the high-frequency network transceiver module is connected to the first Ethernet port and is configured to receive a high-frequency network signal. The indoor network sharing device includes a processing module and a second Ethernet port. The high-speed Ethernet transmission cable has a transmission rate above 1 giga bits per second (Gbps), 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 a 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.