A screen transmission processing method and device. The method includes determining that a source device is connected to a screen transmission device, wherein the screen transmission device is configured to be in a communication connection with a target device with which a pairing is completed; determining that a screen transmission client has been installed in the source device; determining that the screen transmission client is in a state to be updated; in response to the state to be updated, acquiring an update file of the screen transmission client from the target device through the screen transmission device; and according to the update file, updating the screen transmission client.