The invention discloses a ductile cast iron pipe and a ductile cast iron pipe manufacturing method. The ductile cast iron pipe comprises a pipe body, the inner wall of the pipe body is processed through grinding teeth of a tooth-form grinding head of a grinding wheel and then hammered through a hammering component of a steel wire brush, so that the roughness of the inner wall ranges from 40 microns to 100 microns, and the cleanliness of the inner wall reaches the Sa2.5 level; the outer wall of the pipe body is hammered through the hammering component of the steel wire brush, so that the roughness of the outer wall ranges from 40 microns to 100 microns, and the cleanliness of the outer wall reaches the Sa2.5 level; the inner wall and the outer wall of the pipe body are coated with an inner polyethylene coating and an outer polyethylene coating respectively, and the inner polyethylene coating and the outer polyethylene coating are connected into a whole. The ductile cast iron pipe is high in corrosion resistance and low in cost.