With a growing number of high-rise buildings, glass curtain walls are widely used. In the long-term service of such curtain walls, the safety problems arise, such as cracks and spontaneous breakages of glass. Therefore, they need regular inspections to prevent accidents. Current inspection work for glass curtain walls in high-rise buildings mostly depends on manpower and conventional tools such as ropes and gondolas, which exhibit poor performance and safety risks for the workers to operate in the high-elevation working environment. Thus, there is an urgent need for inspection robots to improve efficiency and reduce safety risks. As a preceding work for the development of an inspection robot for glass curtain walls, this paper investigates the existing publications of the robots for the façade works and analyzes the implementation mechanism of an inspection robot for glass curtain walls.