The utility model discloses a water plant collecting device used in inland waters. The water plant collecting device comprises a first gripper, a second gripper and a control plate. Two rotating shafts are respectively arranged at joints of two ends of the two grippers. Mesh pieces are mounted on the grippers. Two first fixing rings are respectively arranged on the rotating shafts, fixing holes are symmetrically respectively arranged in two side faces of the first gripper, and surrounding holes are symmetrically respectively arranged in two side faces of the second gripper and used for mounting a first iron wire, two fastening holes are arranged in the control plate, one fastening hole is used for the first iron wire to pass through, and the other fastening hole is used for fastening a pull rope. A second fixing hole is arranged in the first gripper and used for mounting a second iron wire, and a third fixing hole is arranged in the second gripper and used for mounting a third iron wire. A hooked ring is fixedly arranged on the control plate and is used for hooking the second iron wire and the third iron wire. The water plant collecting device is simple and ingenious in structure, easy to operate, low in manufacturing cost and effective in collecting the water plants, and requirements on quantitative and qualitative investigation of water plant resources are met.