The invention discloses a low-cost quickly-distributed cross-domain communication gateway, and belongs to the technical field of communication gateways. The communication equipment comprises a cabin body of a sealed structure, and a development board
assembly, a communication equipment dry end and an energy
assembly which are connected with one another are fixedly installed in the cabin body; the floating block is of a hollow streamline structure, is arranged outside the cabin body in a sleeving mode, is connected with the end, close to the development board
assembly, of the cabin body through a supporting column and is used for providing
buoyancy and a stable posture for the cabin body. The sealing cover is connected with the top of the floating block through a support, an antenna assembly and a position indicating lamp are sequentially installed in the sealing cover, and the antenna assembly is connected with the development board assembly through a cable. And the communication
machine wet end is arranged below the cabin body at an interval, is connected with the communication
machine dry end through a cable, and is used for hoisting water to collect and process
underwater acoustic communication signals. The low-cost fast-distribution type cross-domain communication gateway is reasonable in appearance, adopts streamline design and
modular design, is compact in structure and convenient to operate, and is particularly suitable for short-term communication requirements in offshore areas.