The invention relates to an in-vehicle response indicating system for vehicle whistling. The in-vehicle response indicating system mainly consists of four vehicle whistling sound detecting sensors, a host vehicle whistling sound shielding circuit, a host vehicle whistling detecting circuit, a vehicle position judging circuit, an audio frequency processing circuit, a user-defined whistling sound selector, an audio frequency magnifying circuit, and a four-track earphone or four-loudspeaker system, wherein the four vehicle whistling sound detecting sensors are distributed at four corners of a vehicle, are connected with the host vehicle whistling sound shielding circuit so as to prevent the condition that host vehicle whistling sound is detected; when whistling of other vehicles is detected, the vehicle position judging circuit judges the position where the other vehicles whistle; the audio frequency processing circuit is connected with the user-defined whistling sound selector, so that the type of the broadcasted audio frequency can be selected and synthetized; and the audio frequency magnifying circuit magnifies a prompting sound which needs to be broadcasted, the prompting audio frequency is broadcasted in the vehicle through the four-track earphone or four-loudspeaker system, so that prompting and position restoring in an auditory system of a driver for the whistling of the other vehicles are realized.