The invention relates to a trunked communication system for customs anti-smuggling, which belongs to the field of customs anti-smuggling communication. The problem that customs anti-smuggling communication is not smooth in the prior art is solved. The trunked communication system for customs anti-smuggling comprises a multi-network integration device and a public network access device. The multi-network integration device and the public network access device are connected with Mobile, Unicom and Telecom operator servers, and monitor the operator servers in real time. The multi-network integration device and the public network access device communicate in a handshake mode to gate the path of the operator server with the strongest signals as a communication link between the multi-network integration device and the public network access device. As the multi-network integration device and the public network access device gate the communication link with the strongest signals, the system can be always kept in a best communication status, smooth communication can be always maintained in the customs anti-smuggling process, and smooth completion of the customs anti-smuggling task can be ensured.