The utility model relates to a photovoltaic power generation especially relates to a quick shutoff system for photovoltaic power generation. Have high security and reliability. Concatenate in the photovoltaic module array, include and turn -off the photovoltaic terminal box fast, the photovoltaic module array includes a plurality of photovoltaic module, and is a plurality of the photovoltaic module series connection after by converge / the contravariant case carries to AC electric network, is equipped with between AC electric network and converging / contravariant case and exchanges distribution system, and is adjacent quick shutoff photovoltaic terminal box concatenates between the photovoltaic module for turn -off photovoltaic module, it includes main floodgate and vice floodgate to exchange distribution system, main floodgate locates AC electric network and converge / the contravariant case between, vice floodgate includes source transformation ware, hand switch and automatic switch, automatic switch and hand switch connect the source transformation ware respectively, the photovoltaic terminal box is turn -offed fast in the connection of source transformation ware. Have security height, the good advantage of stability on the whole.