A wearable surgical robot arm comprising: a base configured to be fixed to an arm of an operator to move together with the arm of the operator; a motion part that has a plurality of accommodating grooves in which a surgical instrument is be mounted and that is moveably installed on the base such that one of the plurality of accommodating grooves is positioned in a first position; a shaft that is disposed such that the shaft moves forward or backward to selectively penetrate the accommodating groove positioned in the first position at a rear of the motion part; a first driver that moves the motion part such that one surgical instrument selected from the surgical instruments mounted in the plurality of accommodating grooves moves to the first position; a second driver that moves the shaft to move the surgical instrument positioned in the first position to a second position positioned in front of the first position; and a third driver that provides driving force to the surgical instrument that moved to the second position, wherein the base is provided with an inputter by which the operator inputs a control signal, and the inputter includes a first inputter for inputting a control signal for driving the third driver to control operations of the surgical instrument and a second inputter for inputting a control signal for driving the first driver and the second driver to replace the surgical instrument, and wherein the second inputter includes a voice inputter for recognizing voice of the operator and a voice recognizer for generating a control signal for driving the first driver and the second driver according to the voice input through the voice inputter such that a replacement of the surgical instrument is made by only the voice of the operator. a base configured to be fixed to an arm of an operator to move together with the arm of the operator; a motion part that has a plurality of accommodating grooves in which a surgical instrument is be mounted and that is moveably installed on the base such that one of the plurality of accommodating grooves is positioned in a first position; a shaft that is disposed such that the shaft moves forward or backward to selectively penetrate the accommodating groove positioned in the first position at a rear of the motion part; a first driver that moves the motion part such that one surgical instrument selected from the surgical instruments mounted in the plurality of accommodating grooves moves to the first position; a second driver that moves the shaft to move the surgical instrument positioned in the first position to a second position positioned in front of the first position; and a third driver that provides driving force to the surgical instrument that moved to the second position, wherein the base is provided with an inputter by which the operator inputs a control signal, and the inputter includes a first inputter for inputting a control signal for driving the third driver to control operations of the surgical instrument and a second inputter for inputting a control signal for driving the first driver and the second driver to replace the surgical instrument, and wherein the second inputter includes a voice inputter for recognizing voice of the operator and a voice recognizer for generating a control signal for driving the first driver and the second driver according to the voice input through the voice inputter such that a replacement of the surgical instrument is made by only the voice of the operator.