The utility model relates to a filth online monitoring device for a mountainous area and adopting double-communication module design. The structure of the filth online monitoring device is as follows: double GPRS communication modules are arranged in a master control circuit; the master control circuit and a storage battery are arranged in a housing of the device; a waterproof antenna penetrates through a through hole in the housing of the device and is arranged at the position below an optical sensing head; a temperature and humidity sensor is arranged at the bottom of the housing of the device; an optical sensor is connected with the housing of the device through a support post; a solar panel is connected with and arranged at the top of the device through the support post and is connected with the storage battery to form a loop, so as to provide power for the optical sensor, the master control circuit and the GPRS modules. Through the double GPRS communication module design, a reliable guarantee is provided for application of the filth online monitoring device in the mountainous area.