Ball valve door is a kind of use of ball as a closing valve, with its easy operation, easy maintenance and versatility is widely used in the industrial field. In order to solve the problem that it is difficult to detect the safety of ball valve doors during operation, a torque measuring platform is designed in this paper, which aims to monitor and identify the safety state of ball valve doors by collecting, processing and analyzing the bending moment of ball valve door skid bar. The valve lever torque measuring platform is composed of signal amplification, active low-pass filter, data acquisition board and other modules to measure the bending deformation caused by the valve lever rotation. The software of measuring platform is designed and developed based on MATLAB to process and store the torque data of ball valve door lever and draw the data graph. The experimental results show that the support vector machine algorithm is used to classify 8 kinds of state data of ball valve door collected by torque measuring platform, and the accuracy rate is 91.67%. It provides powerful data support for automatic identification and early warning of valve door faults.