Methods and devices are provided for an agricultural pesticide-free air sterilization machine. In one embodiment, the machine employs a liquid-gas mixing device, an ozone generator, a water inlet; and/or a water outlet. The mixing device may have a water inlet, a water outlet, a feed pump, a jet device, and/or a liquid-gas mixer. Further, the ozone generator utilizes an oxygen generator, an oxygen storage container, and a high voltage discharge chamber. In other embodiments, the feed pump is connected to the water inlet of the jet device via a hose, and the ozone generator is connected to the gas inlet of the jet device via a gas tube.