The invention discloses a drilling clamp for a long pipe. The drilling clamp for the long pipe comprises a base and a pressing plate; a plurality of V-shaped blocks are arranged on the base; V-shaped grooves are arranged in the V-shaped blocks; bolt holes are arranged in the V-shaped blocks; bolt holes matched with the V-shaped blocks are arranged in the pressing plate and fixed to the V-shaped blocks through bolts; adjusting bolts are arranged at the outer sides of the V-shaped grooves in the V-shaped blocks. According to the drilling clamp for the long pipe, the V-shaped blocks are arranged on the base, the V-shaped grooves are arranged in the V-shaped blocks, the long pipe to be processed is positioned into the V-shaped grooves, then the pressing plate is arranged to cover the V-shaped grooves, the bolts are adjusted to realize clamp, a long pipe body is drilled after the long pipe is positioned and fixed, and therefore, the long pipe can be effectively clamped and fixed, the convenience is provided to process, and meanwhile, the drilling precision and accuracy can be improved.