The invention discloses a dump truck for a mine and a steering brake control device thereof, wherein the steering brake control device comprises a variable capacity pump and a control valve; the control valve comprises a first unidirectional valve which is a safety valve for oil returning when the output oil pressure of the variable capacity pump is greater than the preset value; an oil supply port of the variable capacity pump is connected with an oil supply port of a brake system, and supplies oil for an oil supply port of a steering system through a first unidirectional valve; the first end of the safety valve is connected with the oil supply port of the variable capacity pump or the oil supply port of the steering system; and the second end of the safety valve is connected with an oil return oil box. According to the invention, the oil of the variable capacity pump can be respectively supplied to the steering system and the brake system, connection between a power source and a system pipeline is reduced, and the using is not influenced while the system is simplified.