The invention relates to a detachable landscape wave wall hollow section with concave and convex ribs and a manufacturing method of the hollow section. The hollow section comprises a hollow section body. The two symmetrical concave ribs are arranged at the top of the section body. The manufacturing method includes the following steps that 1, a steel plate blank is obtained; 2, the concave ribs are formed at the left end and the right end of the steel plate; 3, the left end and the right end of the steel plate are bent according to the width of the top of the hollow section; 4, the left end and the right end of the steel plate are bent according to the height of the hollow section; 5, the convex ribs are formed in the middle of the steel plate; 6, the two bent portions which are located at the top and provided with the concave ribs are welded and fixed through high frequency welding; 7, the welded hollow section is placed in a box-type roller for fine formation; 8, the concave ribs and the convex ribs are locally cooled. The hollow section can meet the dual requirements for flood prevention in flood seasons and sight view in non-flood seasons. The manufacturing method solves the machining problems caused by the characteristics that an existing hollow section is large in section, small in wall thickness, complex in shape, high in matching accuracy and the like.