The invention relates to methods for non-destructive testing technology field and used for increasing the efficiency of protecting the in-line inspection tool against explosion while the flaw detection in trunk gas pipelines. Method for the explosion protection of the in-line inspection tool consists in connecting of the instrument compartment power supply circuit of the in-line inspection tool to the power supply unit at the pressure guaranteeing the absence of the explosible gas mixture in the receiving trap, and also additionally monitor the instrument compartment power supply and execution by onboard computer. The system device for protecting the in-line inspection tool from the explosion provides the connection and disconnection of the instrument compartment power supply circuits at a pressure guaranteeing the absence of the explosible gas mixture in the launching (receiving) trap, and lets with the help of the signal acquirement from the low-frequency electromagnetic transmitter, located on the tool, monitor the execution of normal operation modes by the tool.