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The loop closing operation can decrease the power outages of consumers and enhance the reliability of power supply. In low-voltage distribution network, to scientifically assess the risk of loop closing operation, and obtain the risk grade conclusion, a risk assessment method based on fuzzy comprehensive evaluation is proposed. Firstly, the risk assessment indicator system of loop closing operation is established, with the corresponding weights calculated. Secondly, the risk comment set and the calculation method of subordinate degrees are determined. Finally, the fuzzy method is adopted to obtain the risk grade conclusion of loop closing operation, which provides the rationale and technical support for the comprehensive promotion of loop closing operation in low-voltage distribution network. The method is applied to a 123-bus test system, and the risk of loop closing operation is divided into 5 grades. The assessment results are analyzed to verify the effectiveness and feasibility of the proposed method.