Microorganism in-situ expanding culture device

The utility model relates to the technical field of black and odorous water treatment devices, in particular to a microorganism in-situ expanding culture device which comprises a plurality of expanding culture subunits communicated in parallel. Each expanding culture subunit comprises a culture tank, a temperature control module, an aerator and a metering pump; the culture tank is communicated with an external sewage source through a pipeline; the culture tank is communicated with an external microorganism transfer culture pool through a pipeline and a metering pump respectively; the temperature control module comprises a temperature measurement module, a heating wire and a controller; the temperature measuring module is fixedly arranged in the culture tank and is electrically connected with the controller; the heating wire is fixedly arranged in the culture tank and is electrically connected with the controller; the metering pump is electrically connected with the controller; and a gas outlet of the aerator