The invention discloses a correction method for alternating current voltage zero crossing point detection of a power carrier module, which is characterized in that a standard carrier module with the zero crossing point detection error being [delta]t1 sends high-frequency carrier signals with the duration being [delta]t2+T1, low-frequency carrier signals with the duration being T2 and high-frequency carrier signals with the duration being T3 to a detected carrier module to be corrected during a period of [delta]t2 before a zero crossing point; the detected carrier module receives the carrier signals and demodulates the carrier signals into pulse signals, and the detected carrier module captures a falling edge moment t1 and a rising edge moment t2 of the pulse signals and detects a zero crossing point moment t0 of alternating current voltage; if an absolute value of (T2-(t2-t1)) is less than or equal to [delta]t3, the correction is effective; meanwhile, an error value of the zero crossing point moment detected by the detected carrier module is [delta]t1+/-abs(T1-(t1-t0)); and the error value serves as an error modification value of zero crossing point detection of the detected carrier module. The correction method detects the zero crossing point error of the detected carrier module through a hardware circuit according to a software algorithm, and thus a true zero crossing point value is obtained.