The invention discloses a saline-alkali land clayey soil field salinity regulation and control method. The method comprises the steps that average water content of soil 0.5 deep is determined through selecting a saline-alkali land parcel and constructing lateral seepage prevention facilities and water drainage and salt elimination facilities, salt water mineralization degree blending is conducted through utilizing a linear relation between the salt water mineralization degree and soil total salt content, and the blended salt water is used for conducting irrigation, so that the soil salt content reaches a preset concentration, and the purposes of gradient salinity identification and selection of salt tolerance of crops are achieved. The saline-alkali land clayey soil field salinity regulation and control method is simple, convenient and easy to operate, and the method has a larger usage value in saline-alkali land selection of salt-tolerant crops and salt-tolerant crop breeding application.