Collecting and sorting device for shellfish cultured on mud flat

The invention relates to a collecting and sorting device for mudflat cultured shellfish. The collecting and sorting device comprises a vehicle body, a soil loosening assembly, a collecting assembly and a screening assembly. The soil loosening assembly, the collecting assembly and the screening assembly are sequentially installed in the front-back direction of the vehicle body. The soil loosening assembly comprises a plurality of ditching wheels and is used for cutting and pushing the surface of soil, the collecting assembly comprises a plurality of bent rods and is used for digging shellfish out of the surface of the soil, the screening assembly is composed of a plurality of cylinders with screen holes formed in the surfaces, the cylinders are coaxially arranged, and the diameter of the screen holes of the cylinder located on the outer ring is the smallest; the shellfish excavated by the bent rod enters the cylinder on the innermost ring, penetrates through the sieve holes with proper hole diameters in the ro