Spare tire supporting device based on double-row-seat cross-country fire truck carriage

The utility model discloses a spare tire supporting device based on a double-seat cross-country fire fighting truck carriage body, a double-seat cross-country fire fighting truck comprises a cab, a carriage body, a spare tire supporting device and a cross-country chassis, the cab is fixed on the front side of the cross-country chassis, and the carriage body is provided with a framework used for forming the carriage body and supporting the framework of the carriage body. The framework is fixed to the rear side of the cross-country chassis, and a rear vehicle door frame is arranged on the rear side of the framework; the compartment body comprises a double door, the left side of a left door of the double door is hinged to a left frame column of the rear door frame, and the right side of a right door of the double door is hinged to a right frame column of the rear door frame. The spare tire supporting device is arranged on the outward face of any side door in the double doors. The spare tire supporting device is