In this paper, dissolved organic matter (DOM) in crop straw was used as adsorbent and Cd2+ was used as adsorbent to set a single factor to study the adsorption behavior of DOM on cd contamination. The optimal adsorption conditions were found, and the DOM was scanned with UV ism at the spectral level. provide a scientific basis for the later use of DOM in the treatment of Cd2+ in crops. The results of the single-factor test showed that the main factors affecting adsorption were DOM dose and pH. When the dosage of DOM solution was 0.25 mL, the adsorption rate of Cd2+ was about 72.3%, and when the addition of DOM solution reached 89.6%, the adsorption rate reached the highest point was 2 mL. When the pH is between 6 and 8, the adsorption rate of Cd2+ can be maintained in a highly efficient and stable state.