The invention belongs to the field of ultrasonic suspension and liquid physical property measurement method analysis, and particularly relates to an ultrasonic suspension liquid surface tension coefficient measurement method and device. the method comprises the steps: suspending to-be-detected liquid droplets in a standing wave field; exciting the droplets to generate a surface vibration mode; obtaining a surface tension coefficient alpha of the droplets through calculation, wherein omega is the natural angular frequency of vibration of the liquid droplets in an l-order mode, rho is the density of the liquid droplets to be measured, and R is the radius of the liquid droplets to be measured. The device comprises an ultrasonic generator, a pair of ultrasonic transducers and a loudspeaker, and the ultrasonic generator outputs two paths of same-frequency high-power signals to drive the pair of ultrasonic transducers; the pair of ultrasonic transducers are oppositely arranged to form the standing wave field, and the standing wave field is used for adjusting the phases of the pair of ultrasonic transducers through the ultrasonic generator to meet resonance conditions to realize suspension of liquid droplets to be measured; and the output end of the loudspeaker is arranged on one side of the standing wave field and is used for exciting the liquid droplets to be measured to vibrate. The method and device are high in measurement precision and good in test effect.