The invention discloses a method for reducing the surface crack generation rate of a hot-transferred casting blank. The method comprises the following steps that 1) the surface temperature of the continuous casting blank is controlled to be over 950 DEG C when the continuous casting blank passes through a straightening section, and primary rapid cooling is carried out at the cooling speed of 3-6 DEG C/s after the continuous casting blank passes through the straightening section, and the surface temperature of the continuous casting blank is reduced below 500 DEG C; (2) after the surface of thecontinuous casting blank is subjected to primary rapid cooling, the temperature of a core of the continuous casting blank is still over 1150 DEG C, the surface temperature of the continuous casting blank is increased to over 880 DEG C within 10-20 seconds, the continuous casting blank continues to move along a roller bed after temperature increasing and is subjected to cutting and sizing, and thesurface temperature of the continuous casting blank is 700-750 DEG C after cutting and sizing; and 3) after cutting and sizing, the continuous casting blank is subjected to secondary rapid cooling atthe cooling speed of 1.5-3 DEG C/s, the surface temperature of the continuous casting blank is reduced below 450 DEG C, wherein the cooling time is 100-150 seconds. The method can refine the grain size of the surface of the casting blank, and after two times of rapid cooling, the average grain size of the surface of the casting blank can reach 25 micrometers or below.