The invention discloses an industrial dust detector. The industrial dust detector comprises a frame. A support plate is connected to the bottom of the frame movably. A threaded rod is arranged on oneside of the top face of the support plate. The top end of the threaded rod penetrates the frame to extend to the upper side of the frame. A nut is arranged on the partial section, above the frame, ofthe threaded rod in a matched mode. A first motor is arranged on one side of the threaded rod and on the top face of the support plate. A first gear is arranged on an output shaft of the first motor.A second gear is meshed with the first gear. A second gear is arranged on a partial section, below a top plate of the frame, of the threaded rod. A protection box is arranged on one side of the firstmotor and on the top face of the support plate. A first connector is arranged on the inner bottom face of the protection box. A first exhaust fan is arranged on one side of the first connector and onthe bottom face of a cover of the protection box. The industrial dust detector has the advantages of simplicity and reasonableness in structural design, capability of accurately detecting dust contentin a region and significance in air quality improvement.