The utility model relates to an agricultural water -saving irrigation technology field specifically is an utilize solar photovoltaic water -saving irrigation system of highway mass flow canal, and solved to lack in the water -efficient irrigation system of farmland and utilized highway mass flow canal to carry out the rainwater to collect, and then the problem of the combined irrigation mode thatcombines together with solar energy and subirrigation, include the storage water tank and the solar photovoltaic board that set up in the mass flow canal that sets up along highway edge, the farmland,the direction that the mass flow canal was put near the farmland at position wherein is provided with the catch basin, is provided with the water pump in the catch basin, and the water pump has the storage water tank through advancing water piping connection, and the sub -unit connection of storage water tank has the raceway, and defeated water piping connection has the irrigation collecting main, and the irrigation collecting main is connected with and buries irrigation pipe a plurality ofly. The utility model discloses only need once to drop into, sustainability used after mass flow canal and catch basin construction were accomplished, had guaranteed good irrigation effect, and especially china's northwestern part area in dry season irrigation effect is particularly outstanding, can carry out the large tracts of land and use widely.