The website, 11main.com, which is currently in beta, will feature a wide range of products, including "one-of-a-kind items, not available at mass merchants and other large e-commerce sites," Alibaba said. The website displayed an "opening soon" message early on Wednesday.
"Our shop owners are currently unpacking and getting settled," the site said.The invitation-only marketplace, which Alibaba said would be "inspired by the local Main Street shopping experience," will offer products in a variety of categories such as fashion and style, home and outdoor, and jewelry and watches.
The announcement comes as Alibaba prepares for an initial public offering that is expected to raise more than $15 billion - the most since Facebook's IPO in 2012.
The company, founded by Jack Ma, controls 80 percent of all online retail in China, handling about $250 billion in 2013 - more than Amazon and eBay combined.