The invention discloses a method for optimized dispatching of economic benefit of a photovoltaic power generation system. The method comprises the steps of determining a dispatching strategy of the photovoltaic power generation system; building an optimization strategy of the photovoltaic power generation system, wherein the optimization strategy is used for optimizing according to a first allocation proportion when power generation quantity of the photovoltaic power generation system is larger than residual electric quantity of a power utilization load and is used for optimizing according toa second allocation proportion when the power generation quantity of the photovoltaic power generation system is smaller than insufficient electric quantity of the power utilization load; building anoptimized dispatching target function taking benefit of the photovoltaic power generation system within a set period as an optimization target and taking the first allocation proportion and the secondallocation proportion as decision variables; and optimizing the first allocation proportion and the second allocation proportion by employing the dispatching strategy so as to achieve maximum user benefit of the photovoltaic power generation system.