Provided is a high-loop-stiffness PE double-wall corrugated pipe bell mouth structure. The bell mouth structure comprises a leading-in section, a bell mouth section and a connecting section, wherein the leading-in section and the bell mouth section are arranged in parallel, one end of the leading-in section is connected with one end of the bell mouth section through a buffer section, and included angles formed by the leading-in section and the bell mouth section and the connecting section are 5-10 degrees. The loop stiffness of a bell mouth is improved by designing annular reinforcing ribs so as to improve external pressure resisting capability. A leading-in angle and the inner diameter of the bell mouth are greater than the outer diameter of a pipe body to facilitate installation of a tubular product and a rubber ring. The water sealing effect of the bell mouth is improved by adopting the stripping slope design at the bell mouth section.