The utility model relates to a device is proclaimed oneself to oil well cover internal return, this device is proclaimed oneself to oil well cover internal return includes the box, set up the contralateral export pipeline of box and inlet pipe, setting at the link mechanism of box lateral wall, set up baffle and floater at the link mechanism both ends, the baffle lies in export pipeline one side, connects box and link mechanism simultaneously, and the floater lies in inlet pipe one side, the floater can float on oil well cover internal return liquid, makes the baffle block export pipeline, the utility model discloses device is proclaimed oneself to oil well cover internal return, its establishment of institution for the floater can float on oil well cover internal return liquid, makes the baffle block export pipeline, under this kind of structure, if the liquid level is normal, the floater will fall down, and export pipeline is open, if the liquid level risees, the floater will raise, and export pipeline closes, the realization under not influencing the normal operating condition of oil well, the technological purpose of the automatic switching of valve pipe box.