Openable and closeable separate layer fracturing well cementation sliding sleeve

The utility model discloses an openable and closeable separate layer fracturing well cementation sliding sleeve, which comprises an outer barrel; the upper end and the lower end of the outer barrel are respectively provided with an upper joint and a lower joint; a fracturing opening is formed in the side wall of the upper part of the outer barrel; an upper central tube, an upper connecting sleeve, a lower central tube and a lower connecting sleeve are arranged in the outer barrel. As no ball seat is arranged in the openable and closeable separate layer fracturing well cementation sliding sleeve, the full bore of the inner wall can be kept; fracturing fluid can flow back in time, and the construction cycle is shortened; by setting a bottom packer in the upper central tube, when an annulus or coiled tubing is pressurized, an enough large push down force can be generated, so that the upper central tube overcomes a shear force corresponding to a shear pin and moves down, and the opening of the fracturing opening of the well cementation sliding sleeve is realized.