In order to solve the problem of seismic stability of deep tunnel excavation surface under the action of small ducted support. Based on the upper limit method of limit analysis, A calculation model for seismic stability of deep tunnel excavation face under the action of advanced small conduit support is established, and the analytical solution of the extreme value curve of deep tunnel excavation face collapse failure is derived. The influence of tunnel burial depth, rock dynamic compressive strength, material test constant A and seismic coefficient on the extreme value curve of deep tunnel excavation face collapse failure is discussed. The influence of tunnel diameter, tunnel buried depth, seismic intensity and material test constant A on the length of the leading small conduit is analyzed, and the collapse arch length formula is fitted to determine the reasonable number of leading small conduit roots to control the collapse failure of the excavation face of the deep tunnel. The feasibility of the tunnel collapse model and the effectiveness of the support are verified by numerical simulation. The research shows that:; The relative error of collapse arch failure range reaches 37% when earthquake intensity magnitude 7 increases to magnitude 9. The relative error of collapse arch failure range reaches 115% when the buried depth is increased from 250 meters to 1000 meters. Midas GTS NX simulation software is used to verify the correctness of the tunnel face failure model and the effectiveness of the advanced small conduit support. The maximum displacement of the tunnel face through the advanced small conduit support under earthquake action is 3.2995cm when the buried depth is 500m, but other support means must be added to maintain the stability of the tunnel face when the buried depth is more than 500m.