This article starts with the visual analysis by an analytical tool "Citespace" in an effort to investigate the previous studies on universal grammar domestically and overseas in a macroscopic way. It turns out that universal grammar is still received much attention, but there is few systematic review on the accessibility of universal grammar in second language acquisition. Thus, this article systematically sorts out the previous studies in a microscopic way in terms of whether universal grammar can be accessed in second language acquisition. At length, the conclusion is made that currently the hot-discussed topic comes to which aspect of UG is accessible to SLA, instead of whether or not the UG is accessible to SLA.