美国公民需要带护照，不是公民要带绿卡

U.S. citizens

U.S. citizens must carry proper identification such as a valid U.S. passport.

Lawful permanent residents of the U.S.

As of April 26, 2022, lawful permanent residents of the United States must show these documents for all methods of travel to Canada:

• a valid passport from their country of nationality (or an equivalent acceptable travel document) and
• a valid green card (or equivalent valid proof of status in the United States)