The utility model relates to an engine assembly and disassembly tools, more specifically say and relate to an assembly and disassembly tools for engine valve spring. Assembly and disassembly tools include the bow frame body, this bow frame body is including fixed vice body, activity vice body, fixed vice body one end and activity vice body one end swing joint, fixed vice body is fixed respectively with the activity vice body other end and is provided with the uide bushing, uide bushing relative placement and the coincidence of its the central axis, be equipped with the screw rod in the uide bushing respectively, be provided with the clamping ring between the screw rod. The utility model discloses the structure is reliable, convenient operation, and work efficiency is high, can adjust assembly and disassembly tools's height as required to the needs that adapt to different motorcycle types.