Built-in guqin type heat exchanger for ventilation fermentation tank and ventilation fermentation tank

The utility model discloses a built-in guqin type heat exchanger for a ventilation fermentation tank, and relates to the field of fermentation engineering equipment. The built-in guqin type heat exchanger comprises a heat exchange structure and a supporting structure, and the heat exchange structure is fixed to the supporting structure; the heat exchange structure comprises a water inlet gathering pipe, a plurality of ascending heat exchange pipes, a single descending heat exchange pipe, a water outlet gathering pipe and a water outlet connecting pipe. The supporting structure comprises a container wall, a bottom supporting plate, a main support, a pin shaft connecting plate and a round steel frame. The water inlet gathering pipe, the ascending heat exchange pipe, the water outlet gathering pipe, the single descending heat exchange pipe and the water outlet connecting pipe are connected in sequence; circulating water enters from the water inlet gathering pipe, is divided into a plurality of branches through t