Passenger transport means broadcast volume adjusting method and system

The invention discloses a method and a system for adjusting the broadcast volume of a passenger transport vehicle. The method comprises the following steps: acquiring an environmental noise measurement value; judging whether broadcast signals exist or not; if the broadcast signal is detected, adjusting the playing volume according to the noise measurement value; and if the broadcast signal is not detected, the environmental noise value is collected again. The passenger transport means broadcast volume adjusting system comprises a master control system, a broadcast host, a broadcast extension set, a switch and a loudspeaker with a noise acquisition function. According to the system, under the conditions that a noise detection device does not need to be additionally arranged on a vehicle and manual intervention of a driver is not needed, environment noise is collected in real time through the broadcast loudspeaker, the broadcast volume value is automatically adjusted, and the broadcast sound is always kept with