Device switching method, device switching device and data transmission system

The embodiment of the invention provides a device switching method, a device switching device and a data transmission system. The method comprises the steps of: obtaining first transmission stabilityinformation among a data transmitter and multiple data receivers in the on state respectively and second transmission stability information among the data transmitter and data receivers in the off state; and, in the multiple data receivers in the on state, if the first transmission stability information corresponding to any data receiver satisfies a switching condition, controlling any data receiver to be switched to the off state, controlling the target data receiver determined according to the second transmission stability information to be switched to the on state, and controlling the remaining data receivers in the on state to be kept same. In the time period from turnoff of any data receiver to turn-on of the target data receiver, the remaining data receivers for normally receiving data transmission signals e