The embodiment of the application discloses a shared-memory-based message transmission method, system and device. According to one embodiment, the shared-memory-based message transmission method comprises: a to-be-written message is written in a shared memory unit in response to a sending node and the to-be-written message is checked; if the checking is successful, first information for indicatingsuccessful writing of the to-be-written message as well as storage location information of the to-be-written message are sent to a receiving node for monitoring the to-be-written message; and readingcompletion information for indicating reading completion is sent to the sending node in response to the reading completion by the receiving node. Therefore, the transmission efficiency of the communication link is improved and the system resources occupied by the communication layer are reduced correspondingly.