The utility model discloses an integrated optics strong electric field sensor encapsulating shell relates to electric field monitoring technology field, has solved the expend with heat and contract with cold that uses the tail optical fiber of the optic fibre of integrated optics strong electric field sensor after the current encapsulating shell encapsulation and has exerted an influence to the performance of integrated optics strong electric field sensor, leads to the stable relatively poor technical problem of integrated optics strong electric field sensor. This integrated optics strong electric field sensor encapsulating shell includes: the central line coincidence of the fiber waveguide among the cuboid insulating housing of encapsulation outside integrated optics strong electric fieldsensor, cuboid insulating housing's central line and integrated optics strong electric field sensor on the waveguide substrate, two relative sides of cuboid insulating housing respectively are equipped with the optic fibre trepanning of cominging in and going out, and the central line that central line and the cuboid insulating housing of trepanning were come in and go out to each optic fibre does not coincide. The utility model discloses be applied to encapsulation and integration optics strong electric field sensor.