Pre-harvest sprouting inhibitor and method for inhibiting rice pre-harvest sprouting

The invention discloses a pre-harvest sprouting inhibitor and a method for inhibiting rice pre-harvest sprouting. According to the pre-harvest sprouting inhibitor, water serves as a solvent, and eugenol with the concentration of 400-1,200 mg/kg, uniconazole with the concentration of 300-600 mg/kg and maleic hydrazide with the concentration of 400-500 mg/kg are contained. The method for inhibiting rice pre-harvest sprouting comprises the steps that during the period from the milk ripeness final stage to the gold ripeness initial stage of rice, the pre-harvest sprouting inhibitor is evenly sprayed to spikes of the rice. The eugenol low in toxicity and easy to degrade, the uniconazole capable of inhibiting biosynthesis of gibberellin and maleic hydrazide having the strong sprouting inhibitive ability are combined, the rice pre-harvest sprouting rate is effectively reduced, and harvested rice seeds can be maintained with good comprehensive quality; water serves as the matrix of the inhibitor, no organic solvent is added, environmental friendliness is achieved, the production technology is simple, the use amount of materials is small, and cost is low.