A powder suction device comprises a suction nozzle, a powder suction device body, a rotation body, a rotation knob and a position indication device, wherein the suction nozzle is connected to the powder suction device body; a capsule frame and a rotation body rod part which extends downwards are formed in the rotation body, the upper end of the capsule frame is opened, and the rotation body is rotated through operations of the rotation body rod part; the rotation knob comprises a rod base, and one end of the rotation body rod part is stored in a storage hole of a rod base, so the rotation body can be driven by rotation of the rotation knob to rotate together with the rotation knob; and the position indication device is disposed on the powder suction device body or the rotation body or both of the powder suction device body and the rotation body, so the position of the rotation body can be indicated. The powder suction device provided by the invention has a simple structure and can be operated easily. The powder suction device provided by the invention has the advantages that the structure is simple, and the operations are convenient; and a user can judge the position of a capsule in the powder suction device very easily, so operations to be conducted can be decided.