Petroleum wellhead

The invention relates to the technical field of oil exploitation, in particular to an oil wellhead which comprises a jacking transverse fixing plate and an extending cavity fixedly connected to the jacking transverse fixing plate, two air inlet curved pipes are fixedly connected to the jacking transverse fixing plate, and vertical communicating pipes are fixedly connected to the two air inlet curved pipes. The outer ends of the two air inlet curved pipes are both connected with sealing plugs through threads, a vertical circulation pipe is fixedly connected to the jacking transverse fixing plate, a two-way transverse pipe is fixedly connected to the vertical circulation pipe, a water adding conical opening is fixedly connected to the two-way transverse pipe, and a sealing plug plate is connected to the water adding conical opening through threads. The outer ends of the two air inlet curved pipes are fixedly connected with collecting cavities, the two collecting cavities are fixedly connected with sealing block