The invention discloses a site sensing communication method of an ad hoc wireless network, which comprises the following steps that: 1) all mobile and fixed entities in the communication process are equipped with wireless terminals and set as an ad hoc mode, and directly communicate in a point-to-point peer mode without needing a base station or center to transfer; 2) when the entity terminals encounter, the identity is recognized through neighbor discovery, and if the restriction stipulated by the route is met, mutual communication is triggered; otherwise, the entity terminals can delay the transfer and cache the held information until the restriction is met or time is up to discard the information; and 3) a node of each entity terminal can issue the public information thereof or the place thereof; and when the entity terminals encounter, data information interaction is performed according to the communication process so as to realize mutual sensing and recognition of the entities on the site. The method disclosed by the invention has a small code space, a high information transfer submission rate and high expandability and invulnerability, realizes point-to-point direct sensing communication, can obtain the site information around the actual environment of each terminal, and can be applied to the induction of traffic information.