Method for information transmission by utilizing Wi-Fi (Wireless-Fidelity) message length

The invention discloses a method for information transmission by utilizing a Wi-Fi (Wireless-Fidelity) message length. The method is characterized in that information needing to be transmitted is encoded by adopting the Wi-Fi message length, and a UDP (User Datagram Protocol) is used for constructing a data packet; then a Wi-Fi network is used for carrying out information transmission on data sent by more than one Wi-Fi network external equipment; a receiver is subjected to reverse encoding according to predefinition of a sender to accurately restore transmitted information. Compared with the prior art, the method disclosed by the invention has the advantages that current Wi-Fi network transmission of the data sender is not influenced and sending data can be sent to a plurality of sets of equipment outside the Wi-Fi network; on the basis of not changing a Wi-Fi standard communication protocol, two sets of the Wi-Fi equipment needing to be communicated can carry out the information transmission without establishing a network; the method can be applied to data sending to the equipment outside the network through equipment in other cryptographic wireless networks.