Full-metal seal dual-pipe steam injection well head device used for inclined shaft

The invention discloses a full-metal seal dual-pipe steam injection well head device used for an inclined shaft, and relates to the technical field of oil exploitation. A production casing pipe is sleeved with a surface layer casing pipe, the top of the surface layer casing pipe is welded with a simple casing pipe head assembly, the top of the production casing pipe is welded with an oil pipe headfour-way assembly, a four-way inner cavity of the oil pipe head four-way assembly is provided with a main hanger, and a main hanging metal seal assembly, a main hanger inner cavity is provided with asub hanger and a sub hanger metal seal assembly, a first oil pipe and the main hanger are connected to the four-way inner cavity of the oil pipe head four-way assembly, the second oil pipe and the sub hanger are connected into the main hanger inner cavity, a steam injection tree assembly is arranged above the oil pipe head four-way assembly, metal seal rings are arranged in a top groove of the main hanger and a top groove