The invention provides a vehicle light structure. The vehicle light structure is mounted in front of a low beam module or a high beam module of a vehicle light and composed of a decorative unit, a transparent unit and a matching unit, wherein the decorative unit comprises a vehicle light frame unit and a side extending unit, the side extending unit is arranged on one side of the vehicle light frame unit, and the bottom of the vehicle light frame unit is provided with a downwards opening first groove; the transparent unit is adhered to the lower portion of the outer wall of the decorative unitwhere a U-groove is formed, and the U-groove can be inserted into the first groove of the decorative unit to fix the decorative unit and the transparent unit into a whole; the decorative unit and thetransparent unit are fixed onto the outer wall of the matching unit. The invention also provides an assembling method of the vehicle light structure. According to the vehicle light structure, the U-groove structure of the transparent unit is connected with the decorative unit to completely cover an internal mounting structure, and meanwhile, high mounting reliability can be achieved.