A device and method for controlling a real time weaving motion are provided. In order to control operation of a robot in a working space, a main moving path of the robot in the working space is determined, a unit motion constituting the determined main moving path is generated, while a continuous motion in which a unit motion is connected, weaving that dynamically changes offset is generated, and a compensation displacement or a compensation rotation amount that is determined according to the work environment is generated. A position and a rotation amount of the robot are calculated in the working space according to at least one of the unit motion, the weaving, the compensation displacement, and the compensation rotation amount.