The utility model provides a surface casing connecting part for recovering slurry during the well drilling process, and is characterized in that the connecting part comprises an arch-shaped tightening piece, a slurry return pipe, a flange and a lathedog, wherein slurry return ports are formed in the middle of the arch-shaped tightening piece; one end of the slurry return pipe is welded with the flange; the other end of the slurry return pipe is welded with a slurry return port on the convex side of the arch-shaped tightening piece; a sealing strip is arranged at the periphery of a slurry return port on the concave side of the arch-shaped tightening piece; the lathedog is U-shaped; and the end parts of the lathedog are movably connected with two side edges of the arch-shaped tightening piece. By adopting the structure, the fixing method and the sealing method are simple; various difficulties during installation are overcome; electric welding operation is eliminated, so that electric shock hazard is avoided, and the connecting part is beneficial to the health of employees; and the labor efficiency is improved, and the work intensity is reduced, so that a large quantity of time is saved, and the drilling operation is accelerated.