In recent years, the development of global navigation satellite system has become mature, but in the face of complex environments such as urban canyons, forest shading and other scenes, there are often problems of insufficient visible stars and serious satellite signal attenuation, thus forming a positioning blind area. Different from the conventional strategy of finding positioning optimization methods from the satellite end and the receiver end, the GNSS positioning method based on metasurface assistance changes the radio environment from the propagation path, realizes beamforming of satellite signals at different reflection angles, and effectively establishes a virtual line-of-sight link. Firstly, the positioning model is built and a metasurface that can reflect the 15° incident Beidou B1 signal to 30° is designed. Secondly, the relationship between the quality of its reflected signal and the receiving angle and receiving distance is analyzed through darkroom measurement experiments and the beamforming capability is verified. Finally, the pseudo-range single point positioning accuracy of Beidou signal based on metasurface reflection is evaluated. The root mean square error in the east, north and zenith directions were 2.138, 4.456 and 8.268 m, respectively, which verifies the feasibility of metasurface assisted GNSS localization and provides a reference for the subsequent metassural dynamic positioning.