The 4th ACAMAR Workshop which will be held from 6-8, June 2018 at the Wangjiang Hotel, Chengdu, Sichuan, China.The focus of this workshop will be Antarctic astronomy, radio astronomy (including ASKAP, MWA, FAST and SKA), optical instrumentation, and astrophysics. The workshop will also build on the relationships and outcomes of the previous workshops in the series.