Large-drift-diameter high-pressure oil and gas production wellhead device

The invention relates to the technical field of oil and gas production wellhead devices, in particular to a large-drift-diameter high-pressure oil and gas production wellhead device which is characterized in that a base table is arranged on the surface of a Christmas tree, a support is arranged on the surface of the base table, a limiting cylinder and a sliding block are arranged on the surface of the support, a carrying frame is arranged on the surface of the limiting cylinder, and a second limiting cylinder and a threaded cylinder column are arranged on the upper surface of a carrying plate; a stud is arranged in the threaded cylinder, a limiting rod and a supporting column are arranged on the lower surface of the carrying plate, a positioning block is arranged on the surface of the supporting column, a fixed supporting plate and an adjusting supporting plate are arranged on the surface of the carrying seat, and a limiting groove and a through hole are formed in the surface of the carrying seat; the device