The invention discloses a broadband wide angle reflection type half-wave plate, employing a chamber structure; the chamber bottom is a metal reflecting plate, and the interior of the chamber is a metal raster and a dielectric layer. The dielectric layer is introduced to form the chamber structure, and response broadening is performed on the reflection wave polarization transformation effect generated by the metal raster and the metal plate, so as to realize broadband and wide angle of linear polarization electromagnetic wave polarization transformation.