It happened at 12:50 a.m. Tuesday at the Golden City Chinese food store at 4132 North Broad Street.
The attacker is seen on surveillance video walking into the business, knocking the 51-year-old male victim down and punching him repeatedly.
Police say the attacker eventually went through the man's pockets, took $230 in cash, then fled south on Broad Street.
Police have released the following description of the suspect:
Black male, 25-30 years-of-age, 5'7", medium complexion, wearing a blue skull cap, tan hooded jacket, button down shirt, dark colored pants and brown Timberland style boots.
Anyone with information about this crime or suspect is asked to contact Detective Greene at the Philadelphia Police Northwest Detectives Division, 215-686-3353/3354.