To improve the anti-tension capacity of rubber bearing and seismic isolation layer, a new type of anti-tension sliding device is proposed. Based on the software, ANSYS, the fine finite element model of the device is developed, the uniaxial tension, uniaxial shear, biaxial shear and the tension shear properties are investigated by numerical analysis. Results show that the slide rail and the slider have remarkable influences on the tension stiffness of the device, which means the tension stiffness is not merely decided by the steel strand. In the shear state, the slider can slip freely and the biaxial mechanical properties behave independently with each other before the baffle plate touching the slider. When the device is simultaneously subjected to tension and shear, the hysteresis curve of the device is similar to that of the sliding bearing under compression shear state, and it has certain energy dissipation ability. The above conclusions verify that the device is able to improve the anti-tension capacity of bearings and seismic isolated layers, and it has little impact on the horizontal hysteresis properties of the main body. Besides, the numerical simulation of the device provides a good foundation for the following model experiment and the application effect study.