The invention discloses a rapid drying device for gallium oxide powder. The rapid drying device comprises a drying tank. A tank cover is mounted at the top end of the drying tank. A main three-way valve is in threaded connection to one end of a pump machine gas inlet pipe in an engaged manner. A tank body gas inlet pipe is mounted at one end of the main three-way valve, and a connecting pipe is mounted at the remaining end of the main three-way valve. A subsidiary three-way valve is mounted at one end of the connecting pipe. The rapid drying device is scientific and reasonable in structure andsafe and convenient to use; by means of adjustment of the main three-way valve and the subsidiary three-way valve, firstly, gas inside a drying pipe is pumped out through a vacuum pump, and inert gasis injected; the gallium oxide powder is protected inside a chamber through the inert gas, and impurities which are possibly mixed into the gallium oxide powder in the drying process are reduced; itis guaranteed that the purity of the gallium oxide powder is not affected by the external impurities; meanwhile, it is guaranteed that the gas pressure inside the drying tank and the gas pressure outside the gas tank is maintained to be balanced; and the problem that when an existing drying tank maintains the vacuum state for a long time, the tank wall is likely to be damaged is solved.