The utility model relates to a device for double-deck isolation, include: the cantilever beam on the floor is laid at the interval, and cantilever beam's tip stretches out the floor and forms unsettled section, locate the support pole setting of unsettled section perpendicularly, support the pole setting and set up along unsettled intersegmental separating, and the fixed double-deck subassembly of keeping apart that supports in the pole setting of locating. The utility model discloses device for double-deck isolation is because the upper strata keeps apart the subassembly connects through supporting the pole setting with cantilever beam, compares in direct that to spread on cantilever beam the restraint less, and amount of deflection and corner are great, play the effect of buffering to high altitude weight thing, it is more insurable that device for double-deck isolation keeps apart than the individual layer.