Anti-falling protection structure of water drilling machine

The utility model discloses an anti-falling protection structure of a water drilling rig, which relates to the technical field of water drilling rigs and comprises a water drilling rig main body, a motor and a drill bit, an anti-falling ring sleeved on the periphery of a drill bit connector is detachably mounted on the water drilling rig main body, and a plurality of anti-falling wheels are rotatably mounted on the inner wall of the anti-falling ring. An annular limiting groove is formed in the periphery of the anti-disengaging wheel, an anti-disengaging piece clamped in the limiting groove is installed on the periphery of the anti-disengaging ring, and when the drill bit rotates, the anti-disengaging piece is located in the limiting groove all the time. Through the arrangement of the water drilling machine body, the motor, the drill bit, the anti-disengaging ring, the anti-disengaging wheel, the anti-disengaging piece and the adjusting structure, when a connector of the drill bit is broken, the drill bit and