A communication switching method is provided. The method is implemented by a communication switching system. The system includes mobile phones, landline phones, and a RFID server. Each mobile phone includes a RFID tag. Each landline phone includes a RFID reader. The RFID server includes a database. The method includes: putting the call on hold through the IP-PBX; transmitting the mobile phone number of a called mobile phone to the RFID server; searching the database to determine whether the mobile phone number is registered; transmitting the landline phone number corresponding to the mobile phone number to the RFID reader when the mobile phone number is registered; determining whether the landline phone corresponding to the landline phone number is busy; and switching the call to the landline phone corresponding to the landline phone number through the IP-PBX when the landline phone corresponding to the landline phone number is idle.