The invention discloses a method for sharing a stationary tone resource in a multi-module structure, which comprises the steps as follows: a certain main control module is selected as a first main control module in the multi-module structure, and a tone resource board is deployed in the first main control module; the first main control module synchronizes the own stationary tone resource generated by the tone resource board to a second main control module which is not deployed with the tone resource board in the multi-module structure; and the second main control module plays stationary tones to a user according to the synchronous stationary tone resource when needing to play the stationary tones. The invention further discloses a system for sharing the stationary tone resource in the multi-module structure, so that the stationary tone resource in a media gateway of the multi-module structure, the operation cost is lowered, the operation flow is simplified, and the stability and efficiency of the system are increased.