The invention discloses an inter-cut prevention system suitable for a digital television system and an inter-cut prevention method thereof, and relates to the field of digital television system inter-cut prevention. The system concretely comprises a beacon flow generation unit, a beacon flow packaging unit, a television signal transmission unit, a user side and a management center. The beacon flow generation unit is connected with the beacon flow packaging unit. The beacon flow packaging unit is connected with the television signal transmission unit. The television signal transmission unit is connected with the user side and the management center. Reconstruction is performed on the basis of the present terrestrial digital broadcast television and cable digital television equipment, and a set of complete inter-cut prevention method and system are put forward. Various malicious signal interference and illegal signal inter-cutting can be effectively prevented without performing large reconstruction on the system so that the pressure and the cost of manual monitoring can be greatly reduced, the broadcast and television safe operation guarantee system can be improved, and the system and the method play an important role in maintaining the correct public opinion orientation, maintaining the social stability and creating the harmonious society.