The invention discloses a power module dust removing method, system and device and a computer readable storage medium. The method comprises the steps that the current load rate, the current environment temperature and the current cavity interior temperature of a power module are obtained, the current standard cavity interior temperature corresponding to the current load rate is determined according to the corresponding relation, established at the standard environment temperature, between the load rate and the standard cavity interior temperature; and on the basis of the above conditions, thecurrent theoretical cavity interior temperature can be determined, accordingly, the current temperature difference can be obtained through calculation, and if the current temperature difference is larger than or equal to the preset temperature difference threshold value, a draught fan is utilized for conducting dust removing treatment on the power module. According to the power module dust removing method, system and device and the computer readable storage medium, through real-time knowing of the load rate of the power module and the temperature rise situation in a cavity, the current dust accumulation situation is inferred, the draught fan is utilized for conducting dust removal on the power module in time, the problem that heat dissipation of the power module is slow under the low loaddue to dust accumulation is solved, and the service life of the power module is prolonged.