The invention discloses a 
fingerprint head online upgrading method and 
system for an intelligent cloud lock, and a cloud lock. A cloud lock main body is provided with a main control module and an external 
flash memory. The method comprises the following steps: A, a 
cloud server sending a 
fingerprint head upgrading data packet to the cloud lock main body through a gateway, and the main control module writes the received 
fingerprint head upgrading data packet into the external 
flash memory; B, the main control module of the cloud lock main body verifies the received fingerprint head upgrading data packet, if the 
verification result is correct, the main control module sends an upgrading packet receiving completion instruction to the 
cloud server through the gateway, and meanwhile, the step Cis executed; and if the 
verification result is incorrect, requesting to re-send the fingerprint head upgrading data packet to the 
cloud server. The fingerprint head does not need to be disassembled and upgraded by using a special workpiece, so that the fingerprint head can be upgraded and repaired by 
software through a 
wireless communication network conveniently and quickly, a large amount of manpower and 
material resources are saved, and online management of fingerprint head upgrading is realized.