The invention discloses and provides a frequency interference suppression device for a pulse system ground penetrating radar. The frequency interference suppression device for the pulse system ground penetrating radar comprises a supporting rod which is connected with a support plate which is connected with an absorber plate and the supporting rod is provided with a radar antenna. The frequency interference suppression device for the pulse system ground penetrating radar has the advantages of being capable of timely adjusting the shielding scope and direction by utilizing the groove design and being capable of not only effectively absorbing the electromagnetic clutter but also converting the electromagnetic clutter into the heat energy by absorbing coatings and shielding absorption coatings of the absorber plate to effectively avoid the high frequency oscillation between a shielding cavity and a receiving antenna.