The invention discloses an information sending method and a device for a teaching system. The information sending method for the teaching system comprises the steps of obtaining the to-be-transmitted information, storing the to-be-transmitted information in a hard disk, generating UUIDs corresponding to the handwriting information, the original image information and the composite graph information contained in the above to-be-transmitted information respectively, recording the storage addresses of the handwriting information, the original image information and the composite graph information of the above to-be-transmitted information, sending the information, acquiring the information stored in the hard disk based on the storage addresses and the UUIDs on the condition that the information sending operation is failed, and sending the information again. According to the invention, when the information sending operation is failed, the information is sent again. Therefore, the repeated writing, circling and painting actions of a user are avoided, so that the user experience is improved.