Its suitable for the bend and deformation of the metal plates and it can roll the workpieces into the round and arcshapes and the cone ones within its specified ranges. It has the function of prebending the plate at both ends. The two lower rollers are the driving ones and can make the horizontal movement; and the upper is a driven one and can make the up and down movement. The moving manner includes the mechanical and hydraulic ones. The driving shafts are all connectes by the universal couplings. This machine is widely suitable for peteoleum, chemical industry, boilers, shipbuilding, metal structure, machine manufacture and other trades, especially for the roll of the steel trunks with smaller diameter and longer length in power transmission and trandform and other trades.