An excavator hydraulic system, an excavator, and a control method for the excavator hydraulic system belong to hydraulic control systems. The excavator hydraulic system comprises a rotation control system and a central control system which controls actions of the excavator except for a rotation action; the rotation control system comprises a rotation hydraulic pump, a flow control device and a rotation control valve group; the rotation control system is connected with the central control system through an on-off control device; and the on-off control device is connected with a flow direction control device. The technical scheme has the beneficial effects that the rotation hydraulic pump independently supplies the rotation control system during a rotation single-action, and the oil consumption can be reduced; the rotation hydraulic pump controls the oil supply quantity supplied to the central control system through an electromagnetic proportional valve during the operation of a combined action, so that the combined operability is good, and a bucket rod can be prevented from sucking air; and a rotation system only aims at rotation and is a combination of a load-sensitive structure and a normally-open bypass valve, so that the impact during the startup of rotation is reduced, and the rotation operability is improved.
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