The invention discloses a press plate at the welding and fixing position of an oscillating rod end crank of BMW-B47 supercharger volute bypass valve of the Honeywell company. An oscillating rod of thebypass valve is arranged in a shaft sleeve on the inner wall of a volute, the other end of the oscillating rod extends out of the volute wall to be welded with the crank, a gap between a plane and the shaft sleeve is required to be within 0.3 after the crank is welded, the press plate is used for pressing, and the crank is influenced by the position and the angle when being pressed and fixed by the press plate, so that the stress of the crank is uneven and the gap is uneven; now, the press plate is changed to be of a universal structure, a rotating plate and an inner pressing plate of the press plate can freely rotate in the direction of an interval 90 degrees, the inner pressing plate presses the crank plane by using a three-point pressing block, the plane is uniformly stressed, and thegap between the plane and the shaft sleeve can be uniformly kept within a range.