To solve the problem that the integrated optical waveguide electric field sensor can not directly respond to the DC electric field， based on the basic principle of the field milling electric field sensor， a DC electric field sensor composed of a DC motor， a shield electrode， an integrated optical waveguide Mach-Zehnder Interferometer （MZI）， and an induction electrode is designed. Its volume is 87.5 mm×58.5 mm×17.5 mm. The working principle of the integrated optical waveguide DC electric field sensor is derived and a three-dimensional simulation model of the sensor is constructed using the COMSOL software. The simulation results show that the electric field intensity on the sensing electrode changes periodically with the rotation of the shielding electrode. A DC electric field experimental measurement system is established to test the dynamic range of the integrated optical waveguide DC electric field sensor. The results show that the minimum measurable electric field of the sensor is 5 kV/m， the maximum measurable electric field is greater than 140 kV/m， and the linear correlation coefficient is 0.995 1， which is suitable for DC electric field measurement.