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For automatic weather station operating in the field with actual requirements of embedded firmware upgrade, an automatic upgrade method based on wireless public network transmission is designed. The method realizes the reliable transmission of the upgrade file in the wireless network environment by the online upgrade control system and the embedded firmware interaction program. The breakpoint transmission mechanism ensures that the download process has high fault tolerance. And non-feelable upgrade strategy lets the automatic weather station operate normally throughout the upgrade process. The test results show that the method achieves the purpose of design and has the use value for the online upgrade of automatic weather stations widely deployed in the field. This method can also provide reference for automated online upgrade of other field observation equipments.