A device for washing pipes contains: a connector, a case, an impeller, a rotary shaft, an actuation portion, a transmission portion, a cleaning portion, multiple moveable portions, and multiple positioning elements. The connector includes an inflow section, a threaded portion, a connection section, and an inlet. The case includes a partition, an accommodation portion, a screwing orifice, multiple outlets, multiple fixing orifices, a guide portion, and multiple guiding orifices. The impeller includes multiple fins and a central hole. The rotary shaft includes an affix segment. The actuation portion includes a first aperture, multiple second apertures, and a conduct portion. The transmission portion includes a third aperture, multiple drive shafts, an output section, multiple fourth apertures, and multiple fifth apertures. The cleaning portion includes a first opening, multiple second openings, and multiple clean elements. Each has multiple coupling holes, and multiple positioning elements fix related components of the device.