Pressurized drilling device for drilling rod

The utility mode discloses a pressurized drilling device for a drilling rod, which comprises two half-type holding hoops mounted on the drilling rod. Each of two holding hoops is provided with an arc groove and the two holding hoops are connected with each other through a fastening piece, wherein one of the holding hoops is provided with a drilling channel communicated with an arc groove; the drilling channel is connected with an interface of a joint fixedly connected with the holding hoop of the drilling channel, the joint has at least three interfaces, and the other interfaces are respectively connected with a drilling unit and a blowout pipe; and valves are respectively connected to a connecting pipe between the joint and the drilling unit, as well as a connecting pipe between the joint and the drilling unit. The utility model is characterized in that at least one arc sealing slot is formed on the inner wall of one of the holding hoops on the upper and the lower sides of the drilling channel, and each seal