The work aims to propose a control algorithm to improve the weighing accuracy of powder packaging regarding the problem of low control precision of the control system of weightless packaging scale. On the basis of traditional PI control, an intelligent fuzzy control module was added, the fuzzy control algorithm was used to set PI control parameters, and the system was simulated through Matlab simulink analysis software. Compared to traditional PI controllers, the time it took for the fuzzy PI control system to stabilize was reduced by 44%, the overshoot was reduced by 26%, and the time it took for the system to stabilize after being disturbed was reduced by 30%. The fuzzy PI control system is stable, has a small overshoot and strong anti-interference ability, and can effectively improve the packaging control precision of the weightless scale.