The present invention provides a method a device and a system for processing parallel services, which includes: determining, by a synchronization locking server, whether a service request for locking is locked after receiving a locking request sent by a service server, and locking the service request when the service request is unlocked and returning a locking success response to the service server, or returning a locking failure response to the service server when the service request is locked, so as to ensure accuracy of a processing result of the parallel services that are processed across the cities, IDCs or servers.