Abstract: The risk of spontaneous ignition during the withdrawal of the working face is high, high quality injection gels material sealing air leakage in the goaf is an effective means to prevent fire extinguishing. The current gels injection device and process are difficult to achieve the precise of the gel components, which affects the quality of fire prevention and extinguishing engineering. This paper developed a precise automatic rubber pumping device, Taking the 21802 fully mechanized mining face of Qinglong Coal Mine as the project background, the key glue injection parameters were determined, the application test is carried out. The results show that the gel injection device with key parameters, Effectively reduce the CO concentration in the corner of the working face and the bracket. Compared with the large area of extensive gel injection, Greatly reduced the cost, ensured the safety of the working face during the period of mining and removal.