The problem that the conventional pipeline inspection robot cannot be used in large flow rate natural gas pipeline because of high running speed should be solved,a speed control device was proposed to actively adjust the running speed of the robot.The ϕ 610 pipeline robot speed control device was designed,and static test,dynamic test and industrial test were carried out.The static test pressure reaches 10 MPa,the tightness and action accuracy of the bypass valve of the speed control device are effectively verified.The dynamic test results show that the pressure difference generated by the speed control device is most obviously affected when the opening amount of the bypass valve is in the range of 1/2,but which is very small when the opening amount exceeds the range of 2/3.The starting force of the pipeline robot with fixed discharge hole and actual speed reduction ability of the speed control device were tested in industrial test respectively,and starting pressure difference equation of the robot under discharge state was also established.The theoretical and experimental basis for the speed control technology of pipeline robot under the condition of large diameter and high flow rate are provided.