The invention relates to an embedded double-sealing device without a sealing cover and belongs to the technical field of mechanical equipment. According to the sealing device, a front static ring seat is installed on a seat sleeve, and two sealing pairs and spring box assemblies are installed in the chamber formed by the seat sleeve, the front static ring seat and the shaft sleeve. The two spring box assemblies, liquid feeding rings and two dynamic rings are arranged on the shaft sleeve coaxially, and two static rings are installed on the front static ring seat and the seat sleeve body respectively and fixed relatively through rotation prevention pins respectively. The seat sleeve is sleeved outside the shaft sleeve, and a sealing ring is arranged between relative static parts. The dynamic rings and the static rings of the sealing pairs are attached tightly. By arranging a limit plate on the front static ring seat, the sealing device can form a container type whole. During installation, the sealing device can be integrally installed in a machine casing from one direction; during disassembly, replacement or maintenance, the sealing device can be disassembled from a shaft for one time. Therefore, the embedded double-sealing device without the sealing cover is convenient, fast, and capable of improving work efficiency and operation reliability and reducing cost effectively.