Dimming curve correction method and unit, LED lighting device and storage medium

The invention relates to a dimming curve correction method of an LED load, a dimming curve correction unit and an LED lighting device. The dimming curve correction method is used for dimming the LED load composed of yellow and white LED particles, and comprises the following steps of S1, determining an upper limit value PWMmax and a lower limit value PWMmin of the PWM signal output, measuring a current value Imax at the PWM signal output upper limit value and a current value Imin at the output lower limit value, and simulating and adjusting the PWM signal output, when the current value is a first current threshold value, recording the PWM signal output value as PWMtro, wherein PWMtro is smaller than PWMmax and larger than PWMmin; S2, setting y1 = PWMmin, x1 = PWMmin, y2 = PWMtro, x2 = nPWMmin, y3 = PWMmax and x3 = PWMmax, generating a fitting curve based on the coordinates of three points (x1, y1), (x2, y2) and (x3, y3), and obtaining the corrected dimming curve. According to the present invention, the PWM-cu