The utility model discloses a bacterium collecting instrument which comprises a base (1), a suspension (2), a peristaltic pump (3), a motor (4), a speed reducer (5), a frequency converter (6) and a control cabinet (7). The suspension (2) and the peristaltic pump (3) are arranged on the base (1), the motor (4), the speed reducer (5) and the frequency converter (6) are arranged inside the base (1), the frequency converter (6) is connected with the motor (4) by a lead, an output shaft of the motor (4) is connected with an input shaft of the speed reducer (5), an output shaft of the speed reducer (5) is connected with the peristaltic pump (3), and the frequency converter (6) is connected with a control circuit in the control cabinet (7) by a lead. The bacterium collecting instrument has the advantages that the bacterium collecting instrument is of a split structure and is long in service life.