The invention discloses a single cone dryer with a single spiral stirrer, which comprises a conical shell, a stirrer, a top cover, a rod-like collector and a vacuum pump, wherein the stirrer is a single spiral stirrer, is vertically arranged in the conical shell and comprises a stirring main shaft, stirring blades and a supporting member; the spiral stirring blades are fixed on the stirring main shaft, the stirring blades surround the stirring main shaft and spirally extend to the lower part of the stirring main shaft from the upper part of the stirring main at intervals; and the radius of spin of the stirring blades gradually reduces from top down. The rod-like collector comprises a vacuumizing tube, wherein one end of the vacuumizing tube is provided with a filter hood; the filter hook is connected with a gas blowback tube; and the gas blowback tube is provided with a manual ball valve. The single cone dryer of the invention can reduce drying time, make the quality of the product uniform and blocking-free, improves drying efficiency and optimizing drying effect; and the filtering area of the collector is large, the efficiency is high, the detachment and cleaning are convenient, and the degree of risk to the materials is lowered.