The invention discloses a DSA machine capable of achieving quick positioning. The DSA machine comprises a case, a base, a controller, a positioning device, a C-shaped arm, an X-ray emitter, an X-ray detector, a remote controller and a receiver. The positioning device comprises a vertical driving mechanism, a C-shaped arm driving mechanism, a swing mechanism and a rotating mechanism. The vertical driving mechanism is connected with the swing mechanism, one end of the rotating mechanism is connected with the swing mechanism, and the other end of the rotating mechanism is hinged to the C-shaped arm driving mechanism. The controller is electrically connected with the receiver, the vertical driving mechanism, the C-shaped arm driving mechanism, the swing mechanism and the rotating mechanism. The remote controller is connected with the receiver through signals, the remote controller sends out the signals, the receiver transmits the received signals to the controller, the controller sends the signals to the vertical driving mechanism or the C-shaped arm driving mechanism or the swing mechanism or the rotating mechanism, and the C-shaped arm moves in the assigned direction. The DSA machine is stable in swing, high in precision, compact in structure, high in detection efficiency and capable of reducing the amount of X-ray radiation on a user.