Yes, you can. Read this.

来源: 于 2017-11-22 18:51:36 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

https://help.cbp.gov/app/answers/detail/a_id/195/~/currency-and-monetary-instruments---amount-that-can-be-brought-into-or-leave

Please be aware that the CNY/USD exchange rate is terrible in US banks.  For example, you can exchange 6.55 RMB for 1 USD in China, you will need 7.05+ RMB to buy 1 USD in US.