The invention discloses a wedge-shaped inclined slit long-focal-depth Plasmon lens. The wedge-shaped inclined slit long-focal-depth Plasmon lens is characterized in that the wedge-shaped inclined slit long-focal-depth Plasmon lens is formed by constructing a vertical central slit with uniform width and wedge-shaped inclined slits which are bilaterally symmetrical with the central slit on a planar metal film; the lens can realize the focusing effect with long focal depth when the lens is in the vertical incidence condition of polarized light of a transverse magnetic line; in the structure, the central slit is selected as a lens symmetric axis; the wedge-shaped inclined slits appear in pairs for the central slit and are symmetrical with the central slit; the wedge-shaped inclined slits incline outwards relative to the central slit on an incidence plane end, and the slit towards outside most has a bigger inclination angle; when the slit incident end is wider than the emitting end, the symmetric slit inner wall inclination angle, outer wall inclination angle and the width are the same; and the wedge-shaped inclined slit long-focal-depth Plasmon lens realizes the focusing effect with long focal depth for the polarized light of the transverse magnetic line for the planar metal Plasmon lens. The wedge-shaped inclined slit long-focal-depth Plasmon lens is compact in structure, is convenient for preparation and production in reality, and has better application prospects in the optical micro manipulation field, the optical micro processing field and the like.