Basalt　fiber　(BF)　was　mixed　with　sulphoaluminate　cement　(SAC)　to　test　the　mechanical　properties　and　the　electromagnetic　properties.　Additionally,　the　variation　mechanism　of　macroscopic　properties　of　the　SAC-BF　was　analyzed　by　scanning　electron　microscope,　X-ray　diffraction　and　mercury　intrusion　porosimetry.　It　was　found　that　the　BF　can　promote　the　strength　of　the　SAC.　Moreover,　the　BF　was　capable　to　boost　the　electrical　resistivity,　the　imaginary　part　of　the　dielectric　constant　and　the　electrical　loss　angle　tangent　of　the　SAC.　The　real　part　of　the　dielectric　constant　of　the　SAC　was　decreased.　Furthermore,　the　BF　could　increase　the　fluctuation　of　magnetic　conductivity　and　magnetic　loss　tangent,　reduce　the　reflectivity　and　increase　the　transmittance　and　absorption　of　the　SAC.　Finally,　the　BF　did　not　affect　the　hydration　product　type　and　can　refine　the　internal　pore　structure　of　the　SAC.