The invention discloses a remote wireless farmland monitoring system and method. The remote wireless farmland monitoring system comprises a farmland information acquisition subsystem, an irrigation control subsystem, a wireless remote transmission unit, and a cloud computing server, wherein the farmland information acquisition subsystem comprises multiple sensor nodes for acquiring growth information data of farmland crops; the irrigation control subsystem receives irrigation and fertilization commands from the cloud computing server to perform precise fertilization and irrigation; and the cloud computing server performs crop growth simulation day by day in the whole growing period of the crops, computes daily water demand information and growth nutrition information, and sends irrigation and fertilization commands to the irrigation control subsystem in real time. By virtue of the remote wireless farmland monitoring system and method disclosed by the invention, the effect of optimizing and guiding the irrigation and fertilization during crop plantation by farmers is achieved, and more precise irrigation and fertilization control can also be provided so as to achieve the aims of saving water and fertilizer and improving earnings.