Provided in the present invention is a pyraclostrobin aqueous dispersion solid composition, which comprises the following components by weight percentage: pyraclostrobin 5-50%, alkyl sulfonate 0.1-15%, a porous carrier 5-80% and a functional additive 1-45%. Further provided in the present invention is a preparation method for the composition, which comprises: first mixing pyraclostrobin and alkyl naphthalene sulfonate according to a ratio; coarsely crushing the obtained mixture at 35°C or lower to obtain a homogeneous mixture; adding a porous carrier and a functional additive into the obtained homogeneous mixture; finely crushing so as to obtain the pyraclostrobin aqueous dispersion solid composition. The pyraclostrobin aqueous dispersion solid composition prepared in the present invention has good stability in storage at high and normal temperatures, does not collect, does not agglomerate, and will not clog a sprayer filter or spray head, thus making said composition easier for a user to use and increasing
