The invention discloses a vacuum anchor rod which comprises an anchoring section, a vacuum section, an end socket and a rod body. The vacuum section is located between the anchoring section and the end socket. The anchoring section and the vacuum section are located in a reinforced body. A supporting piece is arranged on the boundary between the vacuum section and the reinforced body. A sealing element is arranged between the supporting piece and the end socket. A casing pipe is arranged in the vacuum section. A plurality of small holes are formed in the pipe wall of the casing pipe. A vacuumconduction pipe connected with a vacuum source is inserted in the casing pipe. The vacuum conduction pipe penetrates through the supporting piece and the end socket. The vacuum section is in a vacuumstate when the anchor rod works. By means of the vacuum section, the air pressure of pores of a surrounding soil body can be reduced, and the effective stress in the soil body is increased; the friction force between the soil body and the anchoring section is increased, that is, the anchoring force is increased and the functions of the anchor rod are improved; a vacuum pressure obtaining device issimple, low in price and small in energy consumption, cost is quite low compared with a reinforcement concrete anchor rod, and carbon emission is greatly reduced.