The present invention comprises a method and device for purifying a liquid comprising liquid particles and residual particles, comprising the steps of : - heating the liquid with liquid particles and residual particles for purifying; - carrying the liquid in the form of liquid droplets into a purification space; - applying a similar electric charge to the liquid droplets and to a condensation surface; - evaporating liquid particles in the purification space; - condensing the evaporated liquid particles to form condensation on the condensation surface; - discharging the condensation and the unevaporated residual particles separately.