The utility model relates to a hot type aperture footpath leak source trapping devices that pierces through on line of anticorrosive flue, include inner sealing plate, title page rubber, the inboard damaged anticorrosive coating of flue, take leak source walling of flue, covering rubber, outer seal plate and fastening bolt, take the inboard inboard damaged anticorrosive coating of flue that is ofleak source walling of flue, the inboard damaged anticorrosive coating inboard of flue is equipped with foraminiferous title page rubber, title page rubber inboard is equipped with inner sealing plate, take the leak source walling of flue outside to be equipped with foraminiferous covering rubber, the outer seal plate that the skin external side was equipped with threaded hole is glued to the covering, it is fixed that inner sealing plate, title page rubber, covering rubber and outer seal plate pass through fastening bolt. The beneficial effects of the utility model are that: this device can be under hot construction and installation, do not influence flue gas system normal operating, on -the -spot customization, the degree of freedom is higher, and leaking stopping effect is obvious in the installation back, and the installation is simple and easy, and the preparation is convenient, low cost.