A robot system and a control method of a robot are provided. The robot system includes a robot, a liquid application part being provided on the robot, an application thickness measurement part measuring an application thickness of a liquid applied by the liquid application part, a distance measurement part measuring a first distance from the distance measurement part to an application object, a control part controlling the robot based on the first distance so that a second distance from the liquid application part to the application object becomes constant, a supply amount adjustment part adjusting a supply amount of the liquid to the application object according to the application thickness measured by the application thickness measurement part, wherein the distance measurement part, the liquid application part and the application thickness measurement part are arranged in this order in an application direction of the liquid.