The paper aims to solve the slow convergence speed and inferior path of ACO algorithm with the path planning of mobile robot applied in packaging workshop as the research object. The method of fusing IFWA and ACO was applied for searching. Firstly, the raster map of mobile robot was established. Secondly, the IFWA was used to search the path roughly to take the path obtained as the pheromone increment. Then the ACO subtle search was used for solution. Compared with the traditional method, the method adopted in this paper improved the convergence speed and found the optimal path. The proposed fusion method covers the shortage of FWA and accelerates the convergence of ACO. The two algorithms could be used for mutual complementation.