The invention discloses a solid-sealed polar post and a manufacturing method thereof. The solid-sealed polar post comprises an insulating cylinder 10, a vacuum arc-extinguishing chamber 20, an upper wire outlet seat 30 and a lower wire outlet seat 40. The vacuum arc-extinguishing chamber 20, the upper wire outlet seat 30 and the lower wire outlet seat 40 are all installed in the insulating cylinder 10. The upper wire outlet seat 30 and the lower wire outlet seat 40 are respectively connected with a static contact end and a moving contact end of the arc-extinguishing chamber 20. The inner wall 11, corresponding to the arc-extinguishing chamber 20, of the insulating cylinder 10 is in an umbrella skirt shape. In addition, a silica gel layer 50 is arranged between the inner wall 11 and the arc-extinguishing chamber 20. The solid-sealed polar post has the advantages that the inner wall of the insulating cylinder is in the umbrella skirt shape, and no air gaps exist among the inner wall of the insulating cylinder, the silica gel layer and the outer wall of the arc-extinguishing chamber, so that insulation breakdown is prevented.