According to Official Guinness Records,
The most samurai swords juggled is 4, and was achieved by Josh Horton (USA), at Art Factory, in Paterson, New Jersey, USA, on 3 November 2017.Josh Horton's successful attempt was recorded as part of the ongoing "Chronicles of a Record Breaker" series by sports entertainment network Whistle Sports.
For a complete list of 2017 records, please visit 2017 Guinness Records in United States.