The invention discloses a regeneration control method for an engineering plant, which is characterized in that: when the engineering plant is under a high-load operating state, the exhaust temperature of an engine is higher than an automatic regeneration temperature; then an engine controller automatically controls DPF to realize automatic regeneration; when the engineering plant is under a low-load operating state or idling at idle speed, the exhaust temperature of the engine is lower than the automatic regeneration temperature, and then the engine controller sends a signal to a main controller to enlarge the current of a power solenoid pilot actuated valve of a main hydraulic pump, improve the suction power of the main hydraulic pump, improve the exhaust temperature of the engine, and realize regeneration. The regeneration control method for the engineering plant leads the engineering plant to be capable of implementing automatic regeneration under various operating states without stopping, and improves the working efficiency of the engineering plant.