To prevent alteration of the mixing ratio of a liquid mixing and spraying apparatus attributed to a trouble that the discharge amount and discharge ratio controlled based on the rotation speed of a fixed displacement pump are distributed by the external disturbance hard to be measured to prevent defective curing owing to inferior mixing.

A control apparatus C is installed which is capable of detecting the discharge ration which is disturbed by pressure alteration caused by the external disturbance in some points of long distance hoses Ha2 and Hb2 and correcting the discharge ratio. That is, pressure sensors S1 and S2 for measuring the respective pressure values of a liquid A and a liquid B are installed immediately before an atomizer N, and a flow rate adjustment valve F for controlling the pressure of the B liquid on the basis of the pressure of the liquid A is installed immediately before the pressure sensor S2 and a correction control circuit to keep the flow-in pressure to the atomizer N so as to keep the flow rate ratio prescribed between the liquid A and the liquid B is installed in the control apparatus C.