Double-circular tube drilling clamp

The utility model discloses a double-circular tube drilling clamp which comprises a fixed hoop, a movable hoop and a transmission handle, wherein the fixed hoop comprises a base plate, a first side plate and a second side plate; the first side plate and the second side plate are vertically fixed on one same surface of the base plate; first arc-shaped clamping grooves are formed in the opposite side surfaces of the first side plate and the second side plate; the first clamping grooves are matched with the outer surface of one of two circular tubes; the movable hoop is slidably arranged on the base plate; a second arc-shaped clamping groove is formed in the side surface, opposite to the first side plate, of the movable hoop; the second clamping groove is matched with the other circular tube; the transmission handle is provided with a driving shaft; a threaded part is formed in the driving shaft; the driving shaft penetrates through the second side plate and then is movably connected with the movable hoop; the driving shaft is in threaded connection with the second side plate. By utilizing the double-circular tube drilling clamp, the drilling accuracy is improved; in addition, the distances between the movable hoop and the first side plate and between the fixed hoop and the first side plate are changed by driving the movable hoop through the transmission handle, so as to be applicable to circular tubes of different sizes.