The invention relates to a fault early warning method for an electricity protection device, and solves the problems in the prior art, which includes the following steps: fault inducement of a test device is manually made, and the relation between the input current and the output current in the fault symptom process from the normal operation of the test device to the moment before the fault occursis collected under the action of the fault inducement, a symptom corresponding table of the output current to the input current and the temperature is established, and the sound characteristics of thetest symptom are simultaneously recorded, the test sound characteristic and the recorded normal working noise of each electricity protection device are superposed, and the test sound characteristicsrecorded in step A are removed to form symptom sound characteristics; the input current, output current, working noise and ambient temperature of the electricity protection device are detected duringthe electricity protection task, a measured value is compared with a prediction corresponding table obtained in the step A, and if the difference value of the output current and the predicted output current obtained by the prediction corresponding table exceeds a set threshold value, fault early warning is send out.