The embodiment of the invention discloses a terminal downlink window opening opportunity control method and device, equipment and a medium. The terminal downlink window opening opportunity control method comprises the steps of determining an identifier of a forwarding gateway for forwarding a message between a terminal and a server; determining gateway time delay of the forwarding gateway according to the identifier of the forwarding gateway, wherein the gateway time delay is used for representing the speed of the server responding to the forwarding gateway; setting a set time delay of the terminal according to the gateway time delay, wherein the set time delay is a time difference from the end of sending the uplink message by the terminal to the opening of the downlink window.