The invention relates to the technical field of tunnel construction, in particular to a drilling and explosive filling device for tunnel blasting. The drilling and explosive filling device comprises abase, wherein a supporting base is fixedly arranged on the base, the upper portion of the supporting base is connected with guide connecting columns in series through bolts, and fixed seats are arranged on the guide connecting columns in a sleeving mode. The drilling and explosive filling device for tunnel blasting has the beneficial effects that traditional manual punching and explosive fillingcan be effectively replaced, so that the explosive filling efficiency is improved, and use of manpower is reduced; the device further has a strong continuous operation capability, and thus uniform andcontinuous explosive filling can be carried out on a section of a tunnel; meanwhile, the height of explosive filling can be freely adjusted, so that the device is suitable for tunnel planes with different heights; and due to the fact that a rotating shaft can rotate, the device can be used for filling not only a vertical plane or a horizontal plane with explosive, but also a specific inclined part as required, so that the flexibility of explosive filling is improved, and the device has high practical value.