Abstract: In order to study the mechanical properties of steel fiber recycled aggregate concrete (SFRAC) under triaxial compression, 168 cylinder specimens were tested by considering the parameters of the lateral confining pressure, the replacement rate of recycled coarse aggregate and the volume fraction of steel fiber. The failure pattern of the specimens was observed in the test. The stress-strain curve, peak stress, peak strain and elastic modulus were obtained. Based on the test data, the influence of different parameters on the mechanical performance was analyzed. The results show that under triaxial compression, the specimens are destroyed by oblique splitting. With the increase of confining pressure, the peak of stress-strain curve increases, while the descending section becomes slower, the peak stress, peak strain and elastic modulus of SFRAC all increase significantly. Steel fiber increases the residual strength of the specimen under uniaxial compression and makes the descending section of the stress-strain curve slow down. With the increase of the replacement rate of recycled coarse aggregate, the peak stress and elastic modulus decrease and the peak strain increases. Under triaxial compression, the steel fiber has little effect on the peak stress of SFRAC, and when the volume fraction of steel fiber is 1vol%, the improvement effect on the deformation performance of SFRAC is optimal. Finally, the formulas for calculating the peak stress, peak strain and elastic modulus of SFRAC under triaxial compression are put forward.