With many good performance of the natural plant extract, plant glue drilling fluid is applied more and more extensively in drilling engineering for geological disaster prevention. The environmental protection performance was studied in raw material structure, pollution by polyacrylamide and the toxicity to evaluate accurately on the influence degree on environment. The study proved that main raw material of KL plant glue drilling fluid and drilling fluid system met the environmental requirement with characteristics of no-pollution, natural degradation and being harmless to human and animal.