Direction-controllable deflecting drilling device and deflecting method

The invention relates to a direction-controllable deflecting well drilling device and a deflecting method. The direction-controllable deflecting well drilling device comprises a shell sleeve, a shell sleeve groove, a shell sleeve inner cavity, a rotating shaft, an upper connecting rod, a lower connecting rod, a spring, an upper universal joint, a lower universal joint, a cross joint, a bearing, a bearing groove, a motor, a screw rod, a nut, a sliding ball and a drill bit. The rotating shaft is combined with a groove of the shell sleeve through a sliding ball, and the motor is arranged in an inner cavity of the shell sleeve, connected with the screw rod and then combined with the upper connecting rod through a nut. The lower part of the rotating shaft is connected with an upper universal joint and then connected with a lower universal joint through a cross joint; the lower universal joint is connected with the bearing; the spring is connected with the shell sleeve and the drill bit which is connected with the