The invention relates to an active power optimal dispatching method for suppressing photovoltaic power fluctuation. The method comprises: reading distributed photovoltaic generated power of an hth dispatching period, outputting an ultra short time predicted value PPV(h) and an ultra short time load prediction value PL(h), calculating an active power dispatching instruction PES(h) of an energy storage power station; according to real-time acquired operating state uk (h) and carrying capacity SOCk(h) of each battery pack of the energy storage power station, defining three kinds of dispatching states of the battery packs; determining the active power dispatching instruction of the energy storage power station, according to power distribution priority principle that priority dispatching can optimize charging and discharging battery packs and post-dispatching cannot optimize the charging and discharging battery packs, and according to priority proportional distribution, and using a power distribution strategy of rated power distribution, calculating power values distributed to each battery pack in a current dispatching period; and summarizing the active power dispatching instruction of each battery pack, and sending to the energy storage power station. The method reduces overcharging and over-discharging of battery packs, and prolongs life of the battery packs.