The utility model provides a device for locking of screw rod drilling tool and unblock, including the screw rod casing with set up at the inside customized screw rod of screw rod casing, screw rod casing upper portion is connected and is prevented falling a section of thick bamboo, the top connection is connected on the upper portion of preventing falling a section of thick bamboo, the top connection with prevent falling an internally mounted and have a SMIS section of thick bamboo, SMIS section of thick bamboo upper portion is connected through last spline is vice with the top connection is inside, SMIS section of thick bamboo middle part is provided with the stopping jump ring, it is fixed that the shear pin is passed through in SMIS section of thick bamboo middle part and top connection, the top connection is provided with the stopping step, the top connection middle part is provided with the intercommunicating pore, SMIS section of thick bamboo lower part and customized screw rod under through the spline pair be connected, a SMIS section of thick bamboo is provided with the water conservancy diversion hole, stopping jump ring and stopping step throw off state ultimate range be greater than under the length of spline pair the utility model discloses a simple structure, safe and reliable, the turn on pump circulation results in the screw rod drilling tool problem of rotating when having solved slant ware orientation, locking mechanism unblock after the anchoring of slant ware, the screw rod drilling tool rotates the sidetracking of windowing, has improved branch's well well drilling efficiency greatly