H-4 Employment Protection Act of 2018 This bill prohibits the Department of Homeland Security (DHS) from amending or repealing the rule entitled "Allowing Certain H-4 Dependent Spouses to Apply for Employment Authorization" and requires DHS to apply the rule as in effect on May 26, 2015. The rule was implemented on May 26, 2015, and authorizes employment for H-4 visa spouses of H-1B visa nonimmigrants (specialty occupation) who are in the process of becoming lawful permanent residents or who have H-1B status under the American Competitiveness in the Twenty-first Century Act of 2000.