The invention belongs to the technical field of monitoring equipment and particularly relates to a monitoring system for the working states of bearings. The monitoring system comprises a control system, a total flow detector, fractional flow detectors, temperature sensors, an oil leakage alarm device, an oil leakage position display screen, a bearing high temperature alarm device and a bearing high temperature position display screen, wherein the total flow detector is electrically connected with the control system. When detecting that the ratio of the sum of all the fractional flow detectorsto the total flow detector is smaller than a certain value, the control system controls the oil leakage alarm device to give an alarm. When the ratio of the detection value of each fractional flow detector to the set value of the fractional flow detector in the control system is smaller than a certain value, the number of the fractional flow detector is displayed on the oil leakage position display screen. When detecting that the temperature of each temperature sensor is higher than a certain value, the control system controls the bearing high temperature alarm device to give an alarm, and thenumber of the temperature sensor is displayed on the bearing high temperature position display screen.