Honing clamp for machining special-shaped cylinder hole in engine cylinder body

The invention discloses a honing clamp for machining a special-shaped cylinder hole in an engine cylinder block. The honing clamp comprises a fixing piece and a positioning piece which are used in cooperation. The fixing piece comprises a mounting plate, and positioning pins matched with positioning holes in a product are fixedly connected to the two sides of the mounting plate. A supporting block is further arranged between the mounting plate and the product; a concave arc face is arranged on one side of the filling block, a convex arc face is arranged on the other side of the filling block, and the two sides of the concave arc face make contact with the two sides of the incomplete arc face of the special-shaped cylinder hole to form a complete round hole. The diameter corresponding to the concave arc surface is the same as the diameter corresponding to the incomplete arc surface, and the circle center corresponding to the concave arc surface coincides with the circle center corresponding to the incomplete a