Basalt fiber reinforced recycled aggregate concrete is a sustainable and environmentally friendly concrete material with great high temperature resistance. Mechanical properties can be enhanced after filling concrete into steel tubes to form concrete-filled steel tubes. Post-fire behavior is critical in structural design, as high temperature severely deteriorate the capacity and deformation characteristics of concrete and steel structures. This study established finite element models to assess the post-fire axial compressive behavior of basalt fiber reinforced recycled aggregate concrete-filled steel tube based on 20 short columns axial compressive tests after natural-cooling from 20, 300, 500, and 800 ℃. The findings revealed that recycled aggregate decreased post-fire capacity and stiffness, while basalt fiber reduced post-fire capacity but increased the compressive stiffness of the short columns. Based on test results and existing formulas, a novel constitutive relationship for basalt fiber reinforced recycled aggregate core concrete was formulated, accounting for the impact of basalt fiber content, recycled aggregate replacement ratio, and temperature. The finite element model aligns well with test results and can be used in sustainable basalt fiber reinforced recycled aggregate concrete-filled steel tube design and repair. Five design standards were evaluated to calculate the post-fire load capacity. The assessment shows EN 1994-1-1 performs the best in design standards, followed by AS/NZS 2327, AIJ 1997, and GB 50936-2014. ANSI/AISC 360-16 is the worst which seriously underestimated the load capacity.