The invention relates to a vehicle-mounted umbrella bracket system. The vehicle-mounted umbrella bracket system has a central armrest box (1), and is characterized in that a groove is formed in the central armrest box (1) in the horizontal direction, wherein a bracket base (3) is arranged in the groove, and is capable of horizontally moving; the outer end part of the bracket base (3) can move out of the central armrest box (1); a bracket (7) is arranged in the bracket base (3), and is capable of horizontally move corresponding to the bracket base (3); a shaft (9) is arranged at the outer end part of the bracket base (3); the inner end of the bracket (7) can upwards rotate around the shaft (9), so that a right angle is formed between the bracket (7) and the bracket base (3); and the outer end of the bracket (7) is hinged with a umbrella hanging hook (6).