The utility model relates to a pile casing used on a high-oblique rocky river bed of a shallow soil covering layer. The pile casing consists of a plurality of segments, wherein the segments are connected with one another. The bottom surface of the section at the bottommost part of the pile casing is an oblique elliptical section; and a groove is arranged on a steel plate of the segment at the bottommost part of the pile casing. The pile casing has the advantages that: 1. in the design, the segment at the bottommost part of the pile casing is made of high-hardness Q345 steel, and the 30-degree groove processing is carried out on the steel plate at the bottommost part of the pile casing, so that the pile casing is more easily inserted into a rock, and the pile casing is not damaged when the pile casing encounters the extremal impact stress; 2. in the design, a circle of bucket teeth are uniformly welded on a periphery of the segment at the bottommost part of the pile casing, so that the pile casing can enter the rock more easily, and the rock-entering depth of the pile casing is increased, therefore, the pile casing can be upright and stable; 3. in the design, the bottom surface of the segment at the bottommost part of the pile casing is made into the oblique elliptical section, so that the pile casing is glued more closely to the surface of the river bed; 4. the pile casing thoroughly solves the problem of the concrete leakage of the surface of the river bed during the concreting process of drilled piles.