The invention is applicable to the field of technological improvement on automation equipment and provides a fast and accurate film changing device based on the mobile phone automation equipment. The film changing device comprises a fixing module, an air path device and a product film changing module. The air path device is disposed in the fixing module; the product film changing module is mounted on the fixing module; and the product film changing module is fixed to the fixing module through screws. The air path connection is reliable, the air tightness is good, and air leakage is avoided; the circuit connection is reliable, and the anti-interference capability is high; air paths and circuits are connected at the same time, so that fast air path and circuit butt joint is achieved; and the film changing speed is quite high, only the four screws need to be locked, pulling-out and insertion of air pipes and connectors are omitted, and accordingly, only two or three minutes are needed probably for whole film changing.