The invention discloses an information transmission method, device and system and belongs to the technical field of information. The method includes the following steps: determining whether a first device, an information sharing function of which is started, and a second device, an information sharing function of which is started, meets a relation establishment condition; and if the first device and the second device meets the relation establishment condition, returning an information sending response to the first device and obtaining information sent by the first device and forwarding the information to the second device. After determination that the first device, the information sharing function of which is started, and the second device, the information sharing function of which is started, meet the relation establishment condition, the information sent by the first device is obtained and forwarded to the second device so that the information transmitting first device and second device are automatically matched and thus complexity for realizing information transmission is reduced and information transmission rate is improved and information transmission limitation is reduced.