Abstract: The logical control detection of coal mine safety monitoring system includes whether the control (power off, interlocking) is executed correctly and whether the control execution time reaches the standard. Because the communication mechanism and communication protocol of monitoring system from different manufacturers are different, it is difficult to realize the standardized detection of system logical control function. And the manual detection efficiency is low and the error is large. In order to solve the above problems, based on the analysis of industry standards and safety standard detection requirements, a coal mine safety monitoring system logical control automatic detection device is designed. The device is not limited by a communication protocol and a bus form. It controls multiple sensors to send out interlocking signals in a serial port communication mode. At the same time, I/O interface is used to collect the execution results of system logical control (whether the circuit breaker is powered off). The device records the generation time of the interlocking signals and the generation time of the logical control execution result so as to determine the logical control execution time of the system. The device restores each sensor and the breaker to an initial state after each logical control is executed. The test results show that the device can detect the control execution time reliably and accurately. When testing nearly 300 logical controls, the automatic detection time is about 2 hours, which improves the detection efficiency.