Detection instrument of infiltration coefficient of canal water

The utility model discloses a detection instrument of an infiltration coefficient of canal water. The detection instrument is characterized in that the lower end of a stilling box of which the lower end is opened and a canal bed are sealed; a top plate of the stilling box is provided with an operating rod, an exhaust pipe and a water pipe; the exhaust pipe is provided with a valve; the other end of the water pipe is connected with one end of a transparent water pipe arranged on a floating plate; the other end of the transparent water pipe is communicated with atmosphere; the surface of the transparent water pipe is provided with scales. The detection instrument provided by the utility model has the outstanding advantages that the structure is simple, the detection is convenient, the efficiency is high, the cost is low, and the normal water supply is unaffected.