The invention discloses a bionic viscosity/resistance reducing potato harvester digging shovel applicable to viscose heavy loam, belonging to the technical field of agricultural machinery. With an integrated substrate structure, the digging shovel consists of fixing screw holes, an upper soil touch shoveling face, a convex face I, a concave face I, a shovel handle, a lower soil touch shoveling face, a convex face II and a concave face II, wherein the cross section of the substrate is of an arc structure; the convex arch face is the upper soil touch face of the digging shovel; and the concave face is the lower soil touch shovel face. The convex face I and the concave face I are uniformly distributed on the upper soil touch shovel face on the symmetry of the central axis; the convex face II and the concave face II are uniformly distributed on the lower soil touch shovel face on the symmetry of the central axis; the convex face I and the concave face I are in arc transition connection; and the convex face II and the concave face II are in arc transition connection; and two fixing screw holes are formed in the shovel handle. With novel structure and strong adaptability, the soil sticking ability of the potato digging shovel can be remarkably reduced, the soil entering and resistance reducing detachment performance is enhanced, and the viscosity/resistance reducing property is remarkably improved in comparison with traditional potato digging shovels.