Sound insulation and noise reduction plate with constant temperature function

The sound insulation and noise reduction plate with the constant temperature function comprises a first plate body, a second plate body, a third plate body and an assembling base, communicating cavities are formed in the first plate body, the second plate body and the third plate body, and constant-temperature heat preservation cotton is fixedly installed in the first plate body, the second plate body and the third plate body; an air exhaust hole is externally connected with air exhaust equipment to extract air in the first plate body, so that the air pressure in the first plate body is gradually reduced, and a vent groove in the bottom of a communicating frame can be separated from the interior of a baffle under the dual downward movement action of a sealing piston ring and the communicating frame; the communication cavities in the first plate body, the plurality of second plate bodies and the third plate body can be communicated under the action of continuous air exhaust, and the interiors of the communicat