The utility model discloses a device is installed to electric wire netting regulation and control case relay, including regulation and control case body and relay, the inside rear end surface of regulation and control case body is equipped with the slide, the slide bottom is connected with spring I's one end, the spring I other end is connected with the fly leaf, the inside baffle that has inlayed of slide, the baffle right -hand member is connected with the hitch clevis key, the slide has been installed on the surface through rear end inside regulation and control case body, inside spring I and the fly leaf of being equipped with of slide, be convenient for play fixed relay when using, the slide distance of relay between adjusting of being convenient for, the use quantity of alright increase relay, be equipped with elastic appliance and hitch clevis key on the relay surface, elastic appliance is by the fixed slot, the elasticity structure that spring II and elastic block constitute, play the fixed action when the installation relay, there is the baffle to be convenient for at the inside side -to -side movement that carries on of slide at connection fixture block end connection, be convenient for distance between the regulating relay, be convenient for install more relays, and convenient use.