The invention discloses a solar polycrystalline silicon bell-type DS purifying furnace, comprising a heat insulating layer, a heat conducting plate, an ingot mould, a heating rod and a bell, wherein the heat insulating layer is mounted below the heat conducting plate above which the ingot mould is mounted, the bell is made of fiber material, the inner top surface of the bell is fixed with a ceramic protective plate, and the bell bells on the heat conducting plate and outside the ingot mould, and the heating rod, which is a silicon-molybdenum rod, is inserted into the bell and positioned outside the ingot mould. The solar polycrystalline silicon bell-type DS purifying furnace has the advantages of low running cost, low investment, excellent quality and homogeneousness and high rate of finished products.