The invention discloses a high frequency constant power wireless charging module based on PWM waves. The PWM waves are used for controlling the on and off of a high frequency power mos transistor, toacquire a transmission terminal sine-wave voltage signal; a receiving terminal sine-wave voltage signal is acquired via electromagnetic coupling, the high frequency receiving terminal sine-wave voltage signal is rectified to acquire a direct current signal; the voltage of the direct current signal is reduced by an LMZ35003 chip; the voltage and current of the direct current signal after being subjected to voltage reduction are measured, the real-time power is computed, the duty ratio of the PWM waves of the input end of an IR2104 is regulated, the real-time power is changed, and thus the constant power charging to the nickel-cadmium battery is achieved. The high frequency constant power wireless charging module based on the PWM waves provided by the invention has the advantages of rapid charging speed and high conversion rate from transmission power to received power when being applied to high frequency constant power wireless charging with limited power.