The invention provides an improved poecilobdella manillensis medicinal material activity detection method, which comprises the following steps: taking 0.5 g of poecilobdella manillensis medicinal material, precisely weighing, precisely adding 15 ml of 0.9% sodium chloride solution, fully stirring, leaching for 30 minutes, shaking and filtering in real time, precisely measuring 100 microliters of subsequent filtrate, three times, respectively putting into three test tubes, respectively marking the test tubes as A, B and C, and respectively marking the test tubes as B, C and D; the method comprises the following steps: respectively adding 200 [mu] l of a tris (hydroxymethyl) aminomethane hydrochloric acid buffer solution containing 0.5% of fibrinogen, uniformly shaking, placing 3 parts of tubes to be tested in a water bath, carrying out warm soaking at 37 +/-0.5 DEG C for 5 min, and dropwise adding a thrombin solution containing 40 units per 1 ml. According to the method, the anticoagulant activity of the poecilobdella manillensis medicinal material is rapidly and accurately detected by increasing the dosage multiples of the parallel sample and the thrombin solution within the capacity range of a laboratory technician, and a set of relatively complete operation judgment process is designed.