This article introduces the structural characteristics, working principles and relevant technical requirements for manufacturing and assembly for roller support devices of the grate cooler. It analyzes problems existing in traditional assembly processes and also proposes improvement schemes. It elaborates the assembly process for the roller support device assembly line and explains the design principle and production process of hydraulic auxiliary fixtures. The result of this research realizes the standardized assembly line for roller support devices of the grate cooler with streaming working style, which greatly improves assembly quality and efficiency, significantly enhances product competitiveness, and has high promotion value.