The utility model provides a high-precision full-automatic unfolding and folding device for a vehicle-mounted quick folding antenna, which comprises a central fixed panel and a turnover folding panelwhich form a circular panel together, the turnover panel folding and unfolding driving mechanism is fixed on the hinge and drives the turnover folding panel to be folded or unfolded; an overturning unfolding positioning mechanism, an overturning panel unfolding locking mechanism and an overturning panel storage locking mechanism are mounted on the antenna back frame; after the turnover panel is unfolded, the turnover unfolding positioning mechanism can position the turnover folding panel and the central fixing panel, and then the turnover panel unfolding locking mechanism locks the turnover folding panel; the turnover panel storing and locking mechanism can lock the turnover folding panel after the turnover folding panel is folded and stored in place. According to the utility model, judgment can be carried out according to an acquired state, automatic folding and unfolding of the antenna panel can be completed according to a flow, and a one-key rapid unfolding and folding task of the vehicle-mounted antenna system with the foldable reflecting surface can be rapidly and reliably realized.