The invention provides a communication gateway for rail transit. The communication gateway comprises the components of a universal packet radio service (GPRS) transceiver, a high-level data link control (HDLC) communication physical interface, and a protocol conversion processor between a GPRS protocol and an HDLC protocol, wherein the protocol conversion processor is connected between the GPRS transceiver and the HDLC communication physical interface. Through the communication gateway provided by the invention, reading of data in a data transmission process according to GPRS technology is realized on condition that each equipment in rail vehicles perform data transmission by means of an HDLC communication bus; or a data conversion device which can connect an HDLC wired transmission network with a GPRS wireless transmission network through the GPRS technology is provided in communication between the rail vehicle in which the HDLC communication bus is utilized and external equipment.