The invention discloses an all-directional nutrient solution spraying device for hydraulic engineering irrigation. The all-directional nutrient solution spraying device comprises a base, a firs screwrod, a support platform and a mixing tank, wherein a first material storage tank and a second material storage tank are symmetrically arranged at the left and right parts on the upper side of the fixed frame, and liquid baffles are mounted on liquid outlets in the lower parts of the first material storage tank and the second material storage tank in a sliding manner; and an annular liquid sprayinghead is further mounted at the upper end of a guide pipe in a threaded manner. By utilizing the liquid baffles, the liquid outlets of the first material storage tank and the second material storage tank are intermittently blocked, and a nutrient solution and a water solvent are intermittently discharged into the mixing tank to be stirred and mixed, so that the mixing effect between the nutrient solution and the water solvent is greatly improved, and a non-uniform mixing phenomenon is avoided; and by utilizing the annular liquid spraying head, the spraying range is relatively large.