The present disclosure provides a heating control method and a heating control device. The heating control method includes: acquiring (101) an average current value in a heating circuit of a power battery pack; calculating (102) a current output value required for n^thcycle according to an average current value of the n^thcycle, an average current value of (n-1)^thcycle, an average current value of (n-2)^thcycle, a preset current value, n is equal to or greater than 3; outputting (103) a PWM signal to a switch device of the heating circuit according to a pre-calibrated PWM control parameter corresponding to the current output value so that a difference between an actual current value in the heating circuit and the preset current value is less than a preset threshold.