The present invention relates to a hydraulic system for a forklift, and in the present invention, on the oil discharge path of the second pump, under the condition of that can selectively return the oil discharged by the second pump to the oil tank, was taken to be additionally arranged, so that the forklift driver Even if the work of tilt-in or lift the work device is performed while the gear of the forklift is placed in the forward mode or the reverse mode under the engine's low idle condition, the second pump From the side, the oil stored in the oil tank is induced to prevent high-pressure discharge through the control valve (that is, the oil discharged by the second pump is induced to be returned to the oil bank), and through this, it is caught on the engine side. By lowering the possible load to a minimum, it is possible to guide the forklift driver so as not to be subjected to an uncomfortable situation such as a sudden shutdown of the forklift during work.
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