Pesticide residue adsorbent as well as preparation method and application thereof

The invention relates to a pesticide residue adsorbent as well as a preparation method and application thereof, and the method comprises the following steps: soaking watermelon peel in deionized water, drying, crushing and carbonizing to obtain a watermelon peel carbonized material; and soaking the obtained watermelon peel carbonized material in a zinc chloride aqueous solution, drying and sieving to obtain the pesticide residue adsorbent. According to the invention, various types of pesticides can be simultaneously adsorbed, and less pesticide residues are adsorbed; and a new possibility is provided for removing pesticide residues in fruits and vegetables. Moreover, the treatment method for preparing the adsorbent by using the watermelon peel is simple, the cost is low, the equipment requirement is simple, the adsorption rate of each 1g of the adsorbent on 100ml of 1 [mu] g/ml of pesticides such as prochloraz, pyridaben, abamectin, forchlorfenuron, carbendazim, chlorfenapyr, bifenthrin, deltamethrin, pyraclo