The invention belongs to the technical field of equipment for removing pollutants from water surfaces and particularly relates to a lotus root field duckweed fishing device. The lotus root field duckweed fishing device comprises a rack, a transmission belt and a water pump; the conveying belt and the water pump are both fixedly arranged on the rack; the conveying belt is provided with a bucket; arotating plate is hinged to the rack; a torsional spring is arranged at the hinged position of the rotating plate and the rack; a first switch and a second switch are further arranged on the rack; thebucket is used for pressing the rotating plate to rotate in an abutting manner; the rotating plate can press the first switch or the second switch in an abutting manner; a cylinder is further arranged on the rack; the output end of the cylinder is connected with a pushing plate which is provided with wheel teeth; a gear engaged with the pushing plate is further rotationally connected to the rack,and is provided with a collecting plate; a third switch is further arranged on the rack; a water sucking pipe is connected to the water pump; and a water wheel is rotationally connected with the inner wall of the water sucking pipe and is coaxially connected with negative pressure blades which are arranged below the collecting plate. By adopting the lotus root field duckweed fishing device, duckweed can be collected in a concentrated manner, and the lotus root field duckweed fishing device is mainly used for fishing of the duckweed in lotus root field.