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Abstract Detection and anti‐detection with multispectral camouflage are of pivotal importance, while suffer from significant challenges due to the inherent contradiction between detection and anti‐detection and conflict microwave and infrared (IR) stealth mechanisms. Here, a strategy is proposed to asymmetrically control transmitted microwave wavefront under radar‐IR bi‐stealth scheme using composite metasurface. It is engineered composed of infrared stealth layer (IRSL), microwave absorbing layer (MAL), and asymmetric microwave transmissive structure (AMTS) with polarization conversion from top to bottom. Therein, IR emissivity, microwave reflectivity, and transmissivity are simultaneously modulated by elaborately designing the filling ratio of ITO square patches on IRSL, which ensures both efficient microwave transmission and IR camouflage. Furthermore, full‐polarized backward microwave stealth is achieved on MAL by transmitting and absorbing microwaves under x‐ and y‐ polarization, respectively, while forward wavefront is controlled by precise curvature phase compensation on AMTS according to ray‐tracing technology. For verification, a proof‐of‐concept metadevice is numerically and experimentally characterized. Both results coincide well, demonstrating spiral detective wavefront manipulation under y‐polarized forward wave excitation while effective reduction of radar cross section within 8–18 GHz and low IR emissivity (