Automatic fire extinguishing device for fuming cupboard of laboratory

The utility model discloses an automatic fire extinguishing device for a laboratory fuming cupboard, which comprises a fuming cupboard main body and a fire extinguishing system, a plurality of operation cavities for experiments are arranged at the upper part of the fuming cupboard main body, and fans are correspondingly arranged at the upper parts of the plurality of operation cavities of the fuming cupboard main body. The fire extinguishing system is composed of a fire extinguishing agent storage tank, a control box, a plurality of sprayers and a plurality of fire detectors, the fire extinguishing agent storage tank is arranged on the inner side of the lower portion of the fuming cupboard body, the control box is arranged on one side of the exterior of the fuming cupboard body, and the sprayers are arranged at the tops of the inner sides of the multiple operation cavities correspondingly; the spray head is connected with the fire extinguishing agent storage tank through a conveying pipeline, the multiple fir