The present invention discloses a Bluetooth mesh network system having control authority sharing mechanism that includes an original provisioner node and at least one newly added provisioner node. The original provisioner node stores control authority information related to a Bluetooth mesh network, controls the Bluetooth mesh network accordingly and performs a control authority broadcast. The newly added provisioner node receives the control authority broadcast and establishes connection with the original provisioner node according to a connection protocol. The newly added provisioner node further requests the control authority information from the original provisioner node so as to control the Bluetooth mesh network after receiving the control authority information from the original provisioner node.