Automatic pressure difference adjuster

The utility model relates to an automatic pressure difference adjuster which is used for well top meters on oil fields and which takes the self pressure of media as an energy source The upper cavity of a director (1) is modified to be enclosed on the basis of the original automatic pressure adjusters. One end of a steel pipe (3) (or other metal pipes) is connected to the director (1), and the other end is connected with the header connecting pipe (4) of the lower cavity of a float valve (2). The utility model has the advantages of simplicity, reliability, easy operation and maintenance, and favorable effect in pressure difference adjustment, suitable for adjusting the automatic pressure difference at any occasion where header pressure changes.