To provide a flux recovery device which can remove a flux in a pipe and a method for removing a flux. A flux recovery device 200 according to the present invention recovers a flux from a gaseous mixture containing a flux component, the flux recovery device 200 including: a separation unit 400 configured to separate the flux from the gaseous mixture using water, and to discharge the water containing the flux; a pipe 500 including a second connection port 540, an inclined portion 580, and a first connection port 520, the water containing the flux flowing into the pipe 500 from the second connection port 540, the inclined portion 580 being positioned on a downstream side of the second connection port 540, and extending in a direction intersecting with a vertical line extending in a gravity direction, and the first connection port 520 being positioned on an upstream side of the inclined portion 580; and a pump 220 configured to supply water from the first connection port 520.