The utility model discloses a single-column selector valve device. There are at least three groups of end holes of the stator. Wherein one group is a straight-through group, the other groups are detection groups, two end holes in the straight-through group are directly connected, the two end holes in each detection group are respectively connected with two ends of a chromatographic column, the liquid inlet hole is formed in the rotating axis, one end, facing the rotor, of the liquid outlet hole is positioned on the outer side of the end hole, and a liquid inlet groove of the rotor is linear; aliquid outlet groove of the rotor comprises a linear part with one end connected with the end hole and an annular part passing through the other end of the linear part, and the radius of the annularpart is the distance between the end, facing the rotor, of the liquid outlet hole and the rotating axis. According to the single-column selector valve device disclosed by the utility model, the alternate switching work between chromatographic columns is realized, the scheme that two column selector valves are needed in the conventional device is replaced, and the chromatographic columns do not need to be manually replaced back and forth, so that the operation is more convenient.