Screen projection control method, screen projection control terminal and screen projection system

The invention discloses a screen projection control method, which is applied to a screen projection control terminal, and comprises the following steps: receiving first UPNP information sent by a screen projection sending terminal; checking whether the projection screen sending end and the projection screen receiving end are bound with each other or not according to the first UPNP information; generating a two-dimensional code according to the first UPNP information and sending the two-dimensional code to a projection screen receiving end for display; receiving binding request information sentby a screen projection sending end, wherein the binding request information is generated by scanning the two-dimensional code; binding the projection screen sending end and the projection screen receiving end and sending binding success information to the projection screen sending end; receiving second UPNP information sent by the screen projection sending end, wherein the second UPNP informationcomprises screen projecti