E-2 Visa Improvement Act of 2017 This bill amends the Immigration and Nationality Act to permit a nonimmigrant E-2 alien (treaty investor) who has been in the United States in such status for at least 10 years and has created full-time employment for at least 2 individuals to apply for immediate employment-based immigrant status. Up to 10,000 such visas may be made available each fiscal year. Sons and daughters of E-2 aliens (or aliens seeking such status) can remain on their parent's visa as a child until age 26. Employment authorization may be granted at age 18.