The invention provides a processing method and device for a NAV (Network Allocation Vector). The method comprises the steps of: in a case of determining that a target receiving site which receives a first wireless frame currently is not a first site, ending receiving of the first wireless frame; and according to residual duration time of the first wireless frame and first transmission opportunity duration time carried in the first wireless frame, updating the NAV of the first site or keeping the NAV of the first site unchanged, wherein the residual duration time of the first wireless frame is transmission time for transmitting a residual part of the first wireless frame after ending receiving of the first wireless frame. The processing method and device provided by the invention solve the problem of collision with hidden sites, which is caused by inaccuracy of NAV updating in the prior art, so as to achieve effects of ensuring accuracy of NAV updating, ensuring fairness of transmission and contention channels and reducing collisions between the hidden sites.