River periphytic algae sampling device with controllable area

The invention discloses an area-controllable river periphytic algae sampling device, and relates to the technical field of sampling devices. The telescopic cover is arranged on the right side of the fixed cover, and the left side of the telescopic cover is movably inserted into an insertion groove formed in the inner side wall of the fixed cover. The adjusting mechanism is arranged in a driving groove formed in the left side in the handheld seat, and two mounting grooves are symmetrically and fixedly formed in the upper side and the lower side of the right end of the handheld seat; a water storage tank and a sample collection tank are rotationally arranged in the upper mounting groove and the lower mounting groove through threads respectively; the brush is arranged in the fixed cover and is connected with the adjusting mechanism through a transmission shaft in the middle of the brush; the sampling area is adjusted through the fixed cover and the telescopic cover, so that the sampling device is suitable for sa