Oil seal transmission combined screw drill for directional drilling

The invention relates to the technical field of drilling tools, in particular to an oil seal transmission combined screw drilling tool for directional drilling, which is characterized in that during use, a valve body of a liquid inlet valve is filled with high-pressure drilling fluid, and then a valve core is jacked open, so that the drilling fluid enters an anti-falling shell, then enters a motor assembly through the anti-falling shell, enters a cavity of a stator, and finally enters the cavity of the stator; and the screw rotor is pushed to rotate so as to drive the transmission assembly and the drilling assembly to rotate, so that the drilling action is performed. The connecting rod on the anti-falling shell enters the connecting groove to be connected with the supporting shell, so that the connector extends into the shell, a closed space is formed at the connecting position through the first sealing ring and the second sealing ring, oil is injected into the space formed by the first sealing ring and the s