The utility model relates to an underground pervious insulation device, which is characterized in that the device comprises: a support frame which can be demountable and arranged within the roadway; a roof fixed on the top of the supporting frame; a cylinder arranged on the roof; a control device of gas path comprising an air pump and a control valve and connected with the cylinder through a pipeline; a magnetic chain type baffle which can be placed on the roof while sliding and one end of which is connected with the piston of the cylinder; a delay-start electromagnetic valve and sound-light alarming equipment which are arranged on the top of the roadway in front of the support frame; one end of a plate turn-over is pivoted on the support frame with the other end pulled-in on the electromagnetic valve; a water level sensor is on the warning water line above a drainage pipe in the roadway, and the control device of gas path, electromagnetic valve, sound-light alarming equipment and water level sensor are electrically connected with a power controller respectively. The utility model can form a resistance and partition wall rapidly to set aside more time and space for the escape of miners at the time of the occurrence of permeability faults, reducing the threat to the life safety of miners efficiently when a disaster happens.