Studies of magnetic fields in Herbig Ae/Be (HAeBe) stars can help us to improve our understanding of how the magnetic fields of these stars are generated and how they influence their environment. Measurements were made for 100 stars and only for around 20 HAeBe stars magnetic fields were detected. We compile the catalog of all measurements of the HAeBe stars magnetic fields. The rms mean magnetic field for an ensemble of magnetic HAeBe stars appears to be about of 100 G. This value is 3 times smaller than that for main sequence (MS) AB stars. We study how these weak magnetic fields interact with the matter of the circumstellar disk.