Diamond-like carbon (DLC) films have shown significant application prospects in the field of solid lubrication due to their high hardness, good chemical inertness, low friction and wear properties and especially the superlubricty (friction coefficient lower than 0.01) performance under some certain conditions, which can provide new opportunities for the realization of near-zero friction and wear. Various DLC films (DLCs) were summarized according to the differences in doped elements and bonding structures, and the corresponding mechanical and tribological properties were also overviewed. By comparing the tribological properties of DLCs under different environmental conditions, the sensitivity of DLCs’ friction to environmental atmosphere was mainly illustrated, where the hydrogen atoms in films and atmosphere played important roles. At the same time, a feasible scheme to improve the environmental sensitivity of superlubricity by doping Si element or other elements was proposed. Three kinds of DLCs’ superlubricity mechanisms were mainly introduced: surface passivation theory, graphitization theory and transfer film formation theory. All three mechanisms mentioned above had limitations in some extent, and it was still a scientific difficulty to systematically understand and explore the superlubricity mechanisms of DLCs. Finally, the importance of advanced characterization techniques for the detection of chemistry and microstructure of superlubric interface was emphasized, and further research directions were also proposed.