In order to objectively evaluate the safety risks of the processing of the new modular steel trestle and ensure smooth production, an improved AHP grey cloud model was used to evaluate the safety risks of the manufacturing process of a certain modular wharf. A systematic study was conducted from five aspects: human, machinery, materials, environment, and management, and a safety risk assessment index system was established, including 9 secondary indicators and 28 tertiary indicators. Using an improved Analytic Hierarchy Process to determine the weight values of indicators, the on-site safety risk assessment values are input into the Grey Cloud model to determine the risk level. The research results indicate that this method is suitable for the safety risk assessment of module trestle processing and manufacturing. After analyzing the intersection between cranes and ground operations, inspection and maintenance of mechanical equipment, and the impact of noise, the risk values of three indicators are relatively high, and the corresponding risk prevention measures are proposed.