The intricate internal contour profile and narrow space of the stator make it difficult to accurately measure the cross-sectional profile after the stator processing and use of the all-metal screw drilling tool, and a stator internal contour measurement system of the screw drilling tool was studied. Among them, the mechanical system adopts a parallelogram mechanism to realize the centering function, uses a laser displacement sensor and angular displacement sensor to obtain the radial position coordinates of the stator section, collects data through the ARM processor, and transmits it to the host computer for data processing, and builds a software and hardware platform for the measurement system. The experimental results show that the measurement accuracy of the designed measurement system is ±0.03 mm, and the time to measure one section of the internal contour is within the 60 s, which can adapt to the measurement accuracy requirements of the stator of the screw drilling tool with inner diameters ranging from 98 mm to 180 mm.