The present invention relates to a multi-effect flowable concentrate for seed coating, which comprises the effective ingredients of thiamethoxam and fludioxonil. The multi-effect flowable concentrate for seed coating of the present invention contains 1-55% of thiamethoxam, preferably 5-40%, and 1-65% of fludioxonil, preferably 5-40%. The multi-effect flowable concentrate for seed coating of the present invention can be used for seed coating, has characteristics of long duration, low toxicity and remarkable synergism, and can be applied to control of soil insects such as grub, mole cricket and wireworm in peanut, corn, wheat and rice, and control of insects with sucking mouth part, such as seedling aphide, brown planthopper, thrips, powdery mildew and leafhopper, and control of diseases of fusarium wilt, banded sclerotial blight, full rot, rice blast, powdery mildew and bacterial wilt.