The invention discloses a network access method, device and system. The method comprises the following steps: receiving network access information of a target wireless network; generating corresponding coding information according to the network access information, wherein the coding information is used for indicating a to-be-executed action; and executing a to-be-executed action indicated in thecoding information, analyzing the network access information by the to-be-executed network access equipment according to the to-be-executed action, and accessing the target wireless network through the analyzed network access information. The technical problem that the safety performance of information in the network access process is low due to the fact that a communication mode adopted when theInternet of Things device conducts network access in the prior art is a wireless communication mode is solved.