Hydraulic system for construction equipment

The present invention relates to a hydraulic system for construction equipment and, more specifically, to a hydraulic system of which an actuator is controlled by a pump/motor. The hydraulic system for construction equipment according to the present invention includes logic valves respectively provided to first and second hydraulic lines provided to the actuator. In addition, when the actuator must be operated in a state in which the operation of the actuator is stopped by the closing of the logic values, a pressure difference can be resolved by increasing the pressure in the pump/motor and logic value sections in advance even if a load is applied to the actuator, and thus the actuator can implement a desired operation without being affected by the load. That is, operation controllability of the actuator can be improved.