Drill bit device for holes in arbitrary shapes and drilling method of drill bit device

The invention discloses a drill bit device for holes in arbitrary shapes and a drilling method of the drill bit device, and belongs to the technical field of mechanical drilling. The drill bit device for the holes in the arbitrary shapes comprises a drill bit and further comprises a side blade assembly and a drill bit trajectory disc. The two ends of the side blade assembly are detachably and fixedly connected with a prime motor and the drill bit correspondingly, and point movement of the drill bit is converted into surface movement. The drill bit trajectory disc is clamped at the fixed joint of the side blade assembly and the drill bit, and surface movement of the drill bit is limited in the shape set by the drill bit trajectory disc. According to the drill bit device for the holes in the arbitrary shapes and the drilling method of the drill bit device, the side blade assembly and the drill bit trajectory disc synergistically act; the side blade assembly converts point movement of the drill bit into surface