Surveillance video captured the attack inside of Mora's Mini Mart on the 4500 block of North 19th Street.
The suspects tried to rob a man in his fifties on Friday evening. When he refused to give up money, they began kicking and punching him.
Police arrived and arrested one suspect, Michael Walden, but the other three got away.
The victim is nursing serious injuries.
Anyone with information is asked to contact the Philadelphia Police.