The utility model relates to an it is wireless along with boring deviational survey instrument well device of preventing falling. Its technical scheme is: it is used for cooperating assembly multiunit friction disc and push pedal to be equipped with a plurality of recesses on the body, during the hole of body was installed to the dabber, the dabber lower part was equipped with the recess, lays the depression bar in the recess, and the depression bar fixes in the push pedal through the pin, and the little spring is installed and give radial centripetal force of push pedal in the push pedal recess, reset spring one end and dabber contact, the other end and this internal end face contaction. The beneficial effects are that: the utility model discloses a mechanics principle, conversion direction and enlarged instrument dead weight act on the power for the depression bar for the frictional force that friction disc and non magnetic drill collar inner wall produced is greater than the instrument dead weight far away, guarantees the wireless brill deviational survey instrument well that does not fall of following when the directional sub box split, the utility model discloses it is convenient to dismantle, and every the same part can exchange, reduces the device's running cost.