In order to study the seismic performance and secondary stiffness of steel-fiber composite bar reinforcement （SFCB） reinforced coral concrete columns， low-cycle repeated load tests were carried out on 5 of SFCB coral concrete columns and one reinforced coral concrete column. The results show that compared with the reinforced coral concrete columns， the squeezing effect of the hysteretic curves of SFCB reinforced coral concrete columns is more obvious， but the stiffness degradation and equivalent viscous damping coefficient are smaller. With the increase of reinforcement ratio， the displacement ductility and peak load of the specimen are increased by about 13.41% and 4.51%， respectively. The displacement ductility and peak load of the specimen are increased by 11.80% and 18.39%， respectively. Based on the law of composite materials and the theory of force equilibrium， a skeleton curve model of SFCB reinforced coral concrete columns was proposed， and the calculation results of the model were compared with the experimental results. The results shows a good agreement between them， which further verifies the applicability and accuracy of the model.