1. A vehicle license plate recognition method comprising: Step (a): converting an image of a vehicle into a gray-level image, calculating edge densities of said gray-level image, and defining a region where a vehicle license plate image exists according to said edge densities and a vehicle license plate specification; Step (b): detecting a text area of said vehicle license plate image, partitioning said text area into a plurality of character images, and binarizing said character images to obtain a plurality of binarized character images; Step (c): recognizing a plurality of characters from said binarized character images; Step (d): recombining said characters into a character string of a vehicle license plate and outputting said character string; and Step (e): receiving a next image of said vehicle, which is captured at a different time point, and repeating steps of from said Step (a) to said Step (d) to obtain a new character string from said next image; comparing said character string with said new character string character by character to obtain a comparison result for verifying reliability of recognition.