The present invention relates to an outrigger hydraulic control system of a crane, and more particularly, to an hydraulic balance system of a crane outrigger that can sense the hydraulic pressure of each outrigger to balance the overall hydraulic pressure.;The present invention is a crane having three or more outriggers in the lower portion of the frame supporting the boom, comprising: a plurality of solenoid valves for controlling the flow of pressure oil for providing hydraulic pressure to each of the outriggers; Pressure switches for opening and closing the solenoid valve by intermittently installed on the opposite side to sense the pressure applied to the frame to interrupt the power supplied to the solenoid valve; It is composed of a proportional control valve that operates in accordance with the opening of the solenoid valve to operate to balance the hydraulic pressure of the outriggers on the opposite side.;Outrigger, Jack Cylinder, Rod, Pressure Compensation
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