The utility model relates to a wind direction determination field, concretely relates to telescopic wind vane, including dwang and bracing piece, the weathercock head is connected to dwang one end, other end connection fin, be provided with the pivoted lever on the bracing piece, the pivoted lever pass through rolling bearing with realize the gyration cooperation between the bracing piece, the dwang sets up on the pivoted lever, bracing piece fully adjustable. The beneficial effects of the utility model are that: the problem of during the toxic gas rescue of leaking, the co -altitude wind direction is different, and present wind vane can't accurately record the accurate wind direction of different height, thus the influence rescue is solved.