In this paper crushing mechanical properties of compressive strength, tensile strength, bending-strength and impact resistance about spent lithium-ion batteries and its inner core were tested by electromechanical universal testing machine CMT4000 and pendulum impact testing machine ZBC-25A on the basis of determination methods of plastics national standards.The results show that strength stress-strain relationship of compressive, tensile, bending and shearing of spent lithium-ion batteries and its inner core have the typical features of plastic curves and can obey the Gaussian distribution function with the fit degree (R2) of 0.97.On the other hand, the inner cores modulus of compressive, tensile, shearing and bending increase by 45.52%, 598.4%,-57.27% and 35.32% respectively than those of spent lithium-ion batteries, and the strength law are the same.The results still shows that these stress-strain relationship are tough and soft, and that both spent lithium-ion batteries and the inner core can be yielded and fractured easily due to poor impact resistance.In the case of tensile strength, the inner core wont be fractured when the plastic shell is fractured, they are in relative independence.Therefore, crushing equipment having an impact force attached should be selected in the comminution of waste lithium-ion battery.