Blowout preventer and drilling tool

The invention provides a blowout preventer and a drilling tool, and relates to the technical field of oil exploitation. The blowout preventer comprises a valve body and a valve element, wherein the valve body is provided with a mounting hole, a first opening and a second opening, and the first opening and the second opening communicate with the mounting hole; the inner surface of the mounting hole comprises a bearing surface and a first sealing surface which are arranged at intervals in the extending direction of the mounting hole; and the valve element is slidably arranged in the mounting hole and located between the bearing surface and the first sealing surface, and the valve element is provided with a second sealing surface which can be sealed with the first sealing surface. When the pressure in the blowout preventer is smaller than the pressure of the bottom of a drilled well, the valve element moves towards the first sealing surface until the second sealing surface is attached to the first sealing surfac