A bandwidth management method, characterized in that, applicable to at least two first network devices and a second network device, wherein the at least two first network devices share a transmission channel to perform data transmission with the second network device, the second network device is an evolved Node B, eNodeB, and the at least two first network devices are serving gateways, S-GWs, in a S-GW pool, the method comprising: obtaining, by the second network device, transmission bandwidth of the transmission channel; allocating, by the second network device, initial transmission bandwidth to the at least two first network devices according to a preset rule and the transmission bandwidth; sending, by the second network device, the allocated initial transmission bandwidth information to the at least two first network devices; receiving, by the second network device, traffic information in real-time sent by the at least two first network devices; adjusting, by the second network device, transmission bandwidth of the at least two first network devices according to the traffic information and a preset adjustment rule; and sending, by the second network device, the adjusted transmission bandwidth information to the first network devices, so that the first network devices perform the data transmission based on the adjusted transmission bandwidth; wherein the adjusting the transmission bandwidth of the at least two first network devices according to the traffic information and the preset adjustment rule comprises: reducing the transmission bandwidth from a first network device being light-loaded of the at least two first network devices according to the traffic information; and allocating the reduced transmission bandwidth to the first network device being congested of the at least two first network devices according to the traffic information. obtaining, by the second network device, transmission bandwidth of the transmission channel; allocating, by the second network device, initial transmission bandwidth to the at least two first network devices according to a preset rule and the transmission bandwidth; sending, by the second network device, the allocated initial transmission bandwidth information to the at least two first network devices; receiving, by the second network device, traffic information in real-time sent by the at least two first network devices; adjusting, by the second network device, transmission bandwidth of the at least two first network devices according to the traffic information and a preset adjustment rule; and sending, by the second network device, the adjusted transmission bandwidth information to the first network devices, so that the first network devices perform the data transmission based on the adjusted transmission bandwidth; wherein the adjusting the transmission bandwidth of the at least two first network devices according to the traffic information and the preset adjustment rule comprises: reducing the transmission bandwidth from a first network device being light-loaded of the at least two first network devices according to the traffic information; and allocating the reduced transmission bandwidth to the first network device being congested of the at least two first network devices according to the traffic information. reducing the transmission bandwidth from a first network device being light-loaded of the at least two first network devices according to the traffic information; and allocating the reduced transmission bandwidth to the first network device being congested of the at least two first network devices according to the traffic information.