The invention discloses a conical top mark mold which comprises two symmetric single bodies. The conical top mark mold is characterized in that each single body comprises a conical arc slab; an upper semicircular plate and a lower semicircular plate which are matched with the conical arc slabs and parallel to each other are respectively arranged at upper and lower ports of the conical arc slabs; the radius of each upper circular plate is smaller than that of each lower circular plate; semicircular holes of equal diameters are formed in circle center positions of the upper semicircular plate and the lower half circular plate; positioning sleeves which are perpendicular to the upper semicircular plates are arranged on the outer sides of the semicircular holes of the upper semicircular plates; positioning sleeves which are perpendicular to the lower semicircular plates are arranged on the outer sides of the semicircular holes of the lower semicircular plate; positioning plates which are parallel to the upper semicircular plates and the lower semicircular plates are respectively arranged inside spaces formed by the two pairs of upper and lower positioning sleeves of the two single bodies; flanges which are parallel to straight sides of the upper semicircular plates are arranged on the peripheries of side flat end surfaces of the conical arc slabs; flanges which are perpendicular to the upper semicircular plates and the lower semicircular plates are respectively arranged on the peripheries of the straight sides of the upper semicircular plates and the lower semicircular plates; the two single bodies are connected together through the flanges.