Prawn shell collecting device for prawn culture

The utility model relates to the technical field of prawn culture, and discloses a prawn shell collecting device for prawn culture, which comprises a culture box and a screening device arranged in the culture box, the screening device comprises a motor fixedly mounted in the side wall of one side of the culture box, and a first screw rod rotationally connected to the inner wall of the culture box through a bearing and penetrating through the inner wall of one side of the culture box; the first bevel gear is fixedly connected to the other end of the short shaft, and the second bevel gear is fixedly connected to one end of the first screw and is in meshed connection with the first bevel gear. A control motor is started to drive a short shaft to rotate, the short shaft drives a first bevel gear to rotate, the first bevel gear drives a second bevel gear to rotate, the second bevel gear drives a first screw to rotate, a first threaded sleeve moves on the first screw, the first threaded sleeve drives a limiting sle