90°turning machine is a associated equipment for the assembling machine in the H-beam heavy duty production line. There are 3 sets in one group usually, and used to turn the H-beam from vertical position to horizontal position by 90°turning, so that the beam be conveyed to next step for welding. The “L” type turning arm is driven by hydraulic cylinder, and since there is synchronize valve installed on it, the 3 sets 90°turning machine can do synchronize overturning.