The utility model discloses a folding device of vehicle rearview mirror, including rear -view mirror (1) and being used for installing support (2) at automobile outer side, support (2) are gone up to rotate and are connected with montant (3), are equipped with first gear (4) on montant (3), are equipped with on support (2) to be used for driving the first motor of first gear (4) pivoted (5), be equipped with sleeve (6) on montant (3), montant (3) are connected through circumference stop device with sleeve (6), have cup jointed horizontal pole (7) in sleeve (6), and rear -view mirror (1) sets up on horizontal pole (7), be equipped with second gear (8) on horizontal pole (7), be equipped with on sleeve (6) and be used for driving second gear (8) pivoted second motors (9), and horizontal pole (7) and montant (3) mutually perpendicular. The utility model provides a can observe folding device of vehicle rearview mirror with great visual angle.