Disclosed in the invention is a cylinder-type-square-lattice-photonic-crystal-based high-refractive-index dual-compensation-scattering-cylinder right-angle waveguide. One row of and one column of first dielectric cylinders with high refractive indexes are removed from a photonic crystal to form a right-angle waveguide, wherein the photonic crystal is formed by arrangement of first dielectric cylinders with high refractive indexes in a low-refractive-index background medium according to a square lattice. A second dielectric cylinder with a high refractive index and a third dielectric cylinder with a high refractive index are respectively arranged at two turning parts of the right-angle waveguide. The second dielectric cylinder and the third dielectric cylinder are compensation scattering cylinders; and the first dielectric cylinders are circular columns. The provided right-angle waveguide has the extremely low reflectivity and the high transmission rate; large-scale optical path integration can be realized conveniently; and the broad space is provided for photonic crystal application.