A remarkable feature of recent technological trend is the overlapping and merging of distinct technologies, i.e., technological convergence, which is expected to dominate the next-generation innovation. We firstly sketch out the trend and hotspots of existing studies on technological convergence by using bibliometricsand co-word network analysis. Then, research topics such as definitions, measurements and processes of technological convergence and converging innovation were analyzed and summarized by us through a systematic literature review. We found the definition of technological convergence has been basically clarified, the measurement of technological convergence has attracted the most widespread attention, but research results in other aspects of technological convergence are shallow, dispersal and disjointed at the current stage. To support the development of technological convergence and relevant S&T policies, opening the “black box” of technological convergence process is one of the most urgent problems, and scholars also urgently need to carry out studies on identification, forecast and innovation of technological convergence.