The invention provides a box for placing and protecting fiber splices, comprising a substrate and a cover. The substrate comprises a splice area which is used for placing splices and allowing formation of the splices thereon. A platform protruding from the main body of the substrate comprises a plurality of V-shaped grooves arranged in the top end surface for guiding a plurality of optical fiber. The cover comprises a cover main body which comprises a platform-facing area on the cover. When the substrate and the cover forms a box, the platform-facing area is used for pressing a platform-facing area of the top end surface. The cover main body also comprises a plurality of legs protruding from the part of cover main body except the platform-facing area. A channel for allowing the optical fiber to pass is generated between two specified legs, and the channel is overlapped to cover a splice area for providing splices located therein with the physical protection. The box has a simple structure and provides enough protection for the optical fiber splice.