The invention relates to a rotary transformer, in particular to a wireless power transmission rotary transformer applicable to a high-temperature and high-pressure environment. The wireless power transmission rotary transformer comprises a primary-side steel shell, a secondary-side steel shell and two epoxy resin potting layers; the primary-side steel shell is fixed onto the outer wall of an inner tube, the secondary-side steel shell is sleeved on the outside of the inner tube, a primary-side magnetic core and a secondary-side magnetic core are respectively fixedly embedded into the outer edge of the primary-side steel shell and the inner edge of the secondary-side steel shell, and a primary-side winding and a secondary-side winding are respectively fixedly embedded into the primary-side magnetic core and the secondary-side magnetic core; the primary-side steel shell and the secondary-side steel shell correspond to each other axially, the primary-side magnetic core and the secondary-side magnetic core correspond to each other axially, and the primary-side winding and the secondary-side winding correspond to each other axially; epoxy resin is respectively potted in the primary-side winding and the secondary-side winding to form the two epoxy resin potting layers; the two epoxy resin potting layers correspond to each other axially; and certain gaps are respectively reserved between the primary-side steel shell and the secondary-side steel shell, between the primary-side magnetic core and the secondary-side magnetic core and between the first epoxy resin potting layer and the second epoxy resin potting layer. The wireless power transmission rotary transformer has the advantages of reliability and durability.