The present invention relates to an ultrasonic wave surgery apparatus controlled by a single switch button and a control method of ultrasonic power using the same, where the an ultrasonic wave surgery apparatus controlled by a single switch button comprises: a body with an accommodating space therein, comprising: a grip that can be gripped by the user, and； an ultrasonic wave delivery unit which extends forward by a distance to allow for access to tissue； an transducer unit that is disposed in the accommodating space and which causes oscillations； an ultrasonic transducer unit disposed at the front end of the ultrasonic wave delivery unit and which comprises an end effector that is connected to the transducer unit and receives transmission of oscillations； a gripping unit disposed at the front end of the ultrasonic wave delivery unit and formed to allow variation of the distance thereof from the end effector, comprising an operating portion on the body to allow for control of the gripping portion； a start button disposed on the body and which causes an input signal according to controls by the user, and； a control portion which, if an input signal from the start button occurs once within a preset reference time duration and is sustained, operates the transducer unit at a first oscillation strength, and which, if an input signal from the start button occurs n times within a preset reference time duration and is sustained, operates the transducer unit at an nth oscillation strength.
