The invention discloses a power customer service risk early warning and trend studying and judging method. The method comprises the following steps: S1, statistics: carrying out statistics on factories/enterprises within the range of a power supply station; S2, investigation and understanding: investigating the business condition of each factory/enterprise, the total power consumption per year in recent five years and the month of the peak power consumption per year; and S3, risk assessment: including arrearage risk, safety risk, environmental risk and economic loss per hour of a factory/enterprise caused by power failure. According to the power customer service risk early warning and trend studying and judging method, historical information statistics is carried out on factories/enterprises within the range of the power supply station; and arrearage risks, safety risks and environmental risks of the factories/enterprises in recent five years and economic losses of the factories/enterprises per hour caused by power failure are counted, a model is generated, the factories/enterprises and historical information can be clearly acquired, the power utilization risk trends of the factories/enterprises are known, and a role in risk early warning is played.