The utility model provides a moisture absorption silicon rubber space stop bar, includes the space stop bar body, and the inside and the outside of interior mould through a extrusion tooling and outer mould extrusion moulding's space stop bar body are the ventilative silicon rubber of main part and the spill airtight silicon rubber of cladding outward respectively, and silicon rubber is breathed freely in by the airtight silicon rubber of cladding outside the spill to the main part to be equipped with ventilative groove outside the spill on the side of the airtight silicon rubber of cladding, the ventilative silicon rubber of main part is through ventilative groove and external contact. The utility model discloses owing to adopted the space stop bar body, it has the zeolite powder to add in the ventilative silicon rubber of main part to set up between two glass the time when the space stop bar body, the ventilative silicon rubber of main part can only absorb two blocks of steam between the glass, and used the coupling agent in the airtight silicon rubber of cladding outside the spill, be favorable to improving the intensity and the workability of space stop bar body, have that the heat -proof quality is good, coefficient of heat transfer is low, long service life, flexible, be difficult to damaged, production efficiency is high and advantage such as low in production cost.