The invention relates to a mixed control method used in fractured acidified anti-sand miscible liquids, which mixes the base liquid, liquid and dry powder additive and support agent into miscible liquids, to be fed into well. Wherein, the invention is characterized in that: (1), setting the liquid level of miscible liquids, and adjusting the flux of base liquid, according to the real-time liquid level signal collected by ultrasonic wave liquid level meter, and keeping the liquid level of mix pot at preset height; (2); according to the initial density and end density of support agent, the step base liquid amount, and the collected real-time base liquid flux, calculating out the rotation speed of rotor to fix the transmitted amount of support agent; (3), according to the rate of additive and the collected base liquid real-time flux, calculating out the flux of additive, according to which, using PID control method to automatically adjust the flux of each additive. The invention can real-time adjust the flux of base liquid, based on real-time liquid level, to control it at preset level, to avoid empty and full.