A long-distance drilling and hydrofracturing integrated device and method in underground mine are provided. The device includes a drill bit, a hydrofracturing rod, an anti-impact rod, a hole sealing rod, a high-pressure sealed drill rod and a crawler drill rod feeder sequentially connected end to end. In the method, the drill rod and the hydrofracturing rod are delivered to a designated position while drilling, the drill rod does not need to be taken out, only a crawler drill needs to be improved, high-pressure water holes are added to the rod feeder, and the high-pressure water enters the drill rod from the high-pressure water holes and reaches the hydrofracturing portion. When the hydrofracturing is completed, the drill rod is withdrawn by the crawler drill, reaches another hydrofracturing point, and a hole sealing operation can also be performed.