The three burglars, who were also wearing hats, snatched the watches after they used a hammer to smash the glass door of the ground floor shop at around 6:30 am local time.
Watch shop robberies are rare in the southern Chinese city of seven million people, where only one such incident was recorded last year among a total of around 76,000 reported crimes.
"We believe they were experienced because the incident took place within around three minutes," police chief inspector Ma Kai-keung told reporters. Police have not made any arrests.
Footage from Cable Television News showed heavily damaged glass display tables and a metal hammer at the shop, which was littered with glass fragments.
The trio made their escape after they boarded a grey van parked around the corner of the store, Cable TV reported.