Ring sampler

The invention discloses a ring sampler. The ring sampler includes a plurality of horizontal samplers, a fixing plate, a central shaft, a wireless receiver and an electromagnet control device; the plurality of horizontal samplers are mounted on the fixing plate in a circular distribution; the central position of the fixing plate is provided with a central hole; the central shaft is installed in thecentral hole; two ends of the central shaft are provided with lifting holes for lifting other components; and the wireless receiver and the electromagnet control device are used for receiving a cabindoor switch control signal and controlling the electromagnet and a switch mechanism to close the cabin door. According to the invention, the plurality of horizontal samplers are installed on the fixing plate in a circular distribution, therefore, the volume is smaller, and the structure is more compact, which is convenient for lifting and sampling; the fixing plate can avoid water plants from entangling through the method