The invention relates to a rotatable electrical joint, joint holder and cordless electrical applicance. Prior art electrical connectors have not good coupling mechanical strength, electrical contact, security, and cordless electrical appliance have cloggy area when taken away and placed. The invention directs to solve aforementioned questions. Rotating electrical union joint provides annular electrode and side spring contact piece on front end surface and outer surface of cylindric joint. Electrical joint holder provides annular electrode and bottom contact on inner side wall and bottom in cavity, respectively. Cordless electrical appliance provides rotatable electrical joint and joint holder on the bottom of container and base unit, respectively. It provides advantages such as substantial mechanical connection, reliable electrical contact, security, compact structure, and easy to manufacture parts.