If I reset my router shall lost the access of my cPanel?

There is no reason that you would lose access to cPanel by changing your local IP address, unless your web hosting provider limits access to specific IPs (which would be a strange thing to do if you are using regular shared web hosting, but that's another story).

In the event that you do run into problems, contacting your hosting provider and asking them to check either cPHulk or whichever firewall they may use, for blocks on your IP address, would be the best way forward.