Wireless auxiliary stream device, and screen projection method and system based on wireless auxiliary stream device

A wireless auxiliary stream device, wherein the wireless auxiliary stream device is communicatively connected to a terminal device;

• the wireless auxiliary stream device is wirelessly connected to a video conferencing host;
• the terminal device communicates wirelessly with the video conferencing host through the wireless auxiliary stream device to transmit audio and video data;
• and the wireless auxiliary stream device comprises:
• a first transmission module configured to establish a communication connection between the wireless auxiliary stream device and the terminal device, wherein the wireless auxiliary stream device receives the audio and video data from the terminal device through the first transmission module;
• a second transmission module configured to wirelessly send the audio and video data received by the wireless auxiliary stream device to the video conferencing host, whereby the audio and video data is displayed or played on an audio and video device connected to the video conferencing host;
• a power supply module configured to supply power to the wireless auxiliary stream device, whereby the wireless auxiliary stream device is maintained in a standby mode, wherein the power supply module has a power supply mode and a charging mode;
• and
• a processor connected separately to the first transmission module, the second transmission module, and the power supply module and configured to control the connected first transmission module, second transmission module, and power supply module.