The invention relates to the field of valve processing, in particular to a finish machining device for the end parts of exhaust valve rods. The finish machining device comprises a box; the box is glidingly connected with a sliding plate; each of the end parts of the sliding plate is provided with a chamfering surface; the top part of the box is glidingly connected with worktables; each worktable is provided with a driving mechanism; slotting tools are arranged above each worktable; each slotting tool is provided with a chamfering block; the box is rotatably connected with rotating pieces; eachrotating piece is fixedly connected with a first connecting rod; one end, far away from the rotating piece, of each first connecting rod is rotatably connected onto the corresponding worktable; a part, rotatably connected with the box, of each rotating piece is fixedly connected with a second connecting rod; one end, far away from the rotating piece, of each second connecting rod is rotatably connected with a third connecting rod; the third connecting rods are rotatably connected with the sliding plate; the box body is rotatably connected with fourth connecting rods; and one end, far away from the box, of each fourth connecting rod is rotatably connected onto the corresponding worktable. According to the solution, the three steps of processing lock gutter grooves of the valve rods, chamfering groove edges and performing treatment on small end chamfers are all performed on same equipment.