In the wind tunnel experiment, the friction of the aircraft surface is less than 0.1% of the air pressure. For the measurement of surface friction in small area and small range, there is a contradiction between the accuracy and the reliability of the force balance. In order to solve the above problems, a two-dimensional force piezoelectric sensor which can amplify and measure the milli-newton level surface friction is designed based on the lever principle and the piezoelectric effect of quartz. The test performance is evaluated by the static calibration experiment and dynamic pulse excitation experiment. The experiments show that the measuring range of the sensor can be as low as 50 mN, both the nonlinearity error and repeatability error are lower than 1%, and the natural frequency is 2 428 Hz,which can meet the measurement requirements of surface friction in wind tunnel tests.