Vehicle air-inlet grille switching method and mounting structure

The invention discloses a vehicle air-inlet grille switching method and a mounting structure, a grille mounting hole is formed in a front bumper of a vehicle, and an air-inlet grille is mounted in the grille mounting hole. The air inlet grille has an initial state and a working state; in the initial state, the air inlet grille is in a folded state and is erected at the same time, an inlet of the air inlet grille faces upwards, and the air inlet grille is matched with the grille mounting hole in size so as to seal the grille mounting hole. During switching, the air inlet grille is translated backwards; after translating in place, rotating by 90 degrees to enable the inlet of the air inlet grille to face forwards; the air inlet grille in the horizontal state is horizontally moved upwards; after translation in place, the folded air-inlet grille is opened, namely the air-inlet grille is in a working state; in a working state, the size of the front end of the air inlet grille is matched with that of the grille mou