The aim of this paper was to design an automatic assembling process of plastic handle for steel drum. The manual assembling process of plastic handle steel drum was simulated and the current production process of steel drum including feeding, clamping and positioning was used as reference. An automatic assembling process of plastic handle was proposed, and the process route for automatic assembling of plastic handle for steel drum was designed. Furthermore, the assembling scheme of key units of the automatic assembler of plastic handle for steel drum was also designed, including steel drum feeding, weld joint location, plastic handle feeding, plastic handle flexing and plastic handle assembling. The expectant assembling speed of the proposed process reached up to 60 drum/min, which significantly improved the production efficiency.