The invention discloses a service life predicting system for an automobile rear axle based on an intelligent bearing. The service life predicting system comprises the intelligent bearing, wherein a signal acquired by the intelligent bearing is outputted to an amplifying circuit for amplifying; the amplified signal is outputted to an analogue/digital conversion circuit for carrying out analogue/digital conversion; the analogue/digital conversion circuit is used for outputting a digital signal to a microcontroller; the microcontroller is used for transmitting the digital signal to a PC (Personal Computer) through a communication interface circuit; and the PC is used for receiving the digital signal, analyzing and processing the digital signal, establishing a predicted a linear time sequence model and carrying out the prediction of the service life. The service life predicting system disclosed by the invention is the service life predicting system special for the automobile rear axle and is higher in prediction precision.