The present disclosure discloses a method, an apparatus and a system for controlling a service transmission rate. The method includes acquiring service transmission rate information reported by service gateways in a service gateway group in a distributed environment, the service gateways being gateways that transmit service data in parallel to an identical destination address and limit a transmission rate of service data based on respective flow limiting thresholds; adjusting a flow limiting threshold allocated to each service gateway to a specified value to obtain a specified threshold when a service transmission rate indicated by the service transmission rate information is greater than a flow limiting threshold corresponding to the service gateway, the specified values satisfying that a sum of the specified values on the service gateways is not greater than a bandwidth allocated by an operator to the destination address; and sending the specified thresholds to the service gateways. The present disclosure solves a technical problem that there is no technical solution effectively ensuring that a total traffic of flows limited in parallel satisfies an expected threshold after the flows pass through multiple service gateways in a distributed environment.