The invention relates to a vehicle carton tank bracket. The vehicle carton tank bracket comprises a basic positioning plate provided with a front positioning hole and two back positioning holes; a square clamping plate with a square positioning clamping hole is integrally manufactured at the upper edge of the basic positioning plate; an upper positioning piece and an upper positioning plate forming 90 degrees with the upper positioning piece are integrally manufactured at the edge of the basic positioning plate on the right side of the square clamping plate; an upper mounting hole is formed in the middle part of the upper positioning plate; a front end positioning piece and a front end positioning plate forming 90 degrees with the front end positioning piece are integrally manufactured at the right side edge of the basic positioning plate; a front end mounting hole is formed in the middle part of the front end positioning plate; a lower positioning plate forming 90 degrees with the basic positioning plate is integrally manufactured at the lower edge of the basic positioning plate; and a lower mounting hole is formed in the middle part of the lower positioning plate. The vehicle carton tank bracket largely reduces the mass, relieves the weight, is stable in structure and high in strength, and contributes to safe vehicle driving and energy conservation.