It is not unusual for a professional sewing machine as in a factory setting to be 220-volts. The plug and the receptacle will need to match. If you bought this machine used or it is from another country it may not have a standard plug on its cord so you may have to change it and get a matching receptacle.
You don't sound as if you are sure what you have so I would recommend you hire an electrician to do the work.
Answers based on the mood I am in when you ask!