The invention discloses a dual-liquid sprayer of two liquid on the engine, which comprises the following parts: needle-valve, valve pocket and valve body with spraying hole, wherein the valve pocket (3) is set between the needle-valve (5) and valve body (2); three elements display mutual mating couple-element; the male cone of valve pocket (3) lies on the inner cone of valve body (2) to form the first valve; the concial face of needle-valve (5) and inner cone of valve pocket (3) constitutes the second valve; the pressure chamber (1), first ring-shape cavity (10) and second ring-shape cavity (9) are formed among different position of needle-valve (5), valve pocket (3) and valve body (2); the first channel (4) is set on the valve body (2) in connection with the first ring-shape cavity (10) and the second channel (8) is set on the valve body (2) in connection with the second ring-shape cavity (9). The invention solves the layout difficulty of dual fuel and dual sprayers as well as matingproblem of dual fuel emission bunch direction and combustion chamber.