Based on the existing problems in the traditional measurement method of liquid viscosity coefficient，like low repetition rate，large error and small measurement range，it adopts single chip microcomputer and metalsensor to improve the existing device． The metal sensor senses the metal ball，cooperates with the single chipmicrocomputer to time and display the time results，and the computer is used to calculate the liquid viscosity coefficient．The experimental results show that the measurement process of the improved measuring device isintuitive and accurate，the error of the viscosity coefficient measured and calculated is small，and it is suitable for measuring the viscosity coefficient of opaque liquid，which widens the detection range of liquid．