The invention discloses a method and equipment for adaptively setting CPU performance of a pen and electricity adapter and a storage medium. According to the method, the machine learning process of the power adapter is achieved through a voltage comparison circuit and software setting to identify the power wattage of the power adapter, then embedded controller software calculates and sets the power wattage, change of CPU power limit setting is achieved, and reasonable matching of CPU performance and an external power adapter is achieved. The invention provides a method for adaptively setting CPU performance of a pen and electricity adapter, equipment, and a storage medium. Adapters with different wattage can be fully utilized; the power limitation of the CPU can be reduced by the adapter which is smaller than the standard wattage, the downtime risk of a notebook computer is avoided, and the power limitation of the CPU can be increased gear by gear by the adapter which is higher than the standard wattage, so that the richness of the CPU is fully utilized, the performance of the CPU is improved, and the use experience of a user is improved.