The invention relates to an automatic load regulation system and a method for a dry quenching waste heat power generation, and belongs to the technical field of coking waste heat recycling safety. The system comprises a rotation speed controller and a DCS system connected with a generator set. The DCS system comprises a man-machine operating unit used for monitoring the steam condition of a dry quenching steam turbine generator set. A control signal is sent to a servo amplifier of the system after a regulating command is received and a fixed value regulation is carried out by the rotation speed controller, then an intake control valve of a steam engine is regulated. The man-machine operating unit is provided with two working modes, namely, an automatic regulation and a manual regulation. According to the automatic load regulation system and the method for the dry quenching waste heat power generation, an automatic regulation control mode is designed, a man-machine operating interface is created, regulation on the generation load based on changes of the steam condition is achieved, the fully automatic regulation of the dry quenching generation load is achieved, and the automatic regulation on the generation load is achieved. Accordingly, problem in the prior art that manual regulation on the generation load based on changes of the steam condition is solved.