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To address the challenges of low mechanization and limited theoretical research in shellfish harvesting on Chinese mudflats, a crawler mudflat shellfish mechanized brush-screen cooperative vibration harvester was designed for harvesting mudflats shellfish. This device integrated a double-deck vibrating screen and multi-stage roller brush system to efficiently excavate, screen，and transport shellfish. The white clam was used as the research object. The theoretical analysis of the double-deck vibrating screen and the first double-spiral harvesting roller brush were conducted and the key structural and operational parameters were then calculated. The mudflat shellfish harvesting single-factor test was conducted by using discrete element method （DEM） and multi-body dynamics （MBD） coupled simulations. The identified key structural parameters included a crank length of 10 mm for the double-deck vibrating screen and a spiral angle of 30° for the first double-spiral harvesting roller brush. The prototype was developed, and mudflat shellfish harvesting orthogonal field tests were conducted in Jinzhou City, Liaoning Province. The tests considered operational parameters such as crank rotation speed, the first double-spiral harvesting roller brush rotation speed, and secondary cleaning roller brush rotation speed. The optimal parameter combination was determined to be a crank rotation speed of 870 r/min, the first double-spiral harvesting roller brush rotation speed of 65 r/min, and secondary cleaning roller brush rotation speed of 110 r/min. Under these conditions, the device achieved a clam harvesting efficiency of 133.80 kg/h, a clam breakage rate of 5.25%, and a clam missing rate of 7.46%. Post-harvest, the shear strength of the mudflat at a depth of 50 mm was decreased by 65.13%, and the juvenile clam return rate was 92.29%, supporting the sustainable cultivation of shellfish. This device met the production requirements for mudflat shellfish harvesting and it can serve as a valuable reference for the mechanization of shellfish harvesting in China.