The present invention discloses a deposition furnace for preparing a quartz glass mound. The deposition furnace comprises a furnace body; the furnace comprises a furnace top, a furnace wall and a furnace bottom, which form a furnace hearth; a burner is disposed on the furnace top; a base rod vertically extends into the furnace from the furnace bottom, and can move on a vertical direction relative to the furnace body, and rotates with the of the axis as a rotation axis; a deposition substrate is provided on top of the base rod, and is fixedly connected with the base rod; the deposition substrate has diameter greater than the diameter of the base rod; the deposition substrate provides a basis for the deposition of the quartz glass mound; an auxiliary heating device is around the periphery of the deposition substrate within the furnace hearth and is for increasing the edge temperature of the quartz glass deposition mound. The invention reduces the temperature gradient of deposition surface, increase the distribution consistency of the ingredients of the quartz glass deposition mound, and produces quartz glass deposition mound with uniform radial and axial structure.