The invention relates to a container port sealing device, and particularly relates to a leakage-proof end cover which is capable of supporting compact array arrangement of a mechanical rotating shaft and preventing liquid leakage along a rotating axial surface of the rotating shaft. The leakage-proof end cover is composed of three parts including a trimming bearing cover, a leakage-proof ring and an opening loop, and the three parts comprise sixteen constituent parts, namely, tangent planes, an end cover plate, fastener holes, an end cover top surface, a shaft hole, a leakage-proof groove, a lower protruding ring, an inner ring hole, leakage-proof surfaces, clamping leg brushes, a material containing groove, leg brush inclined planes, an outer cylindrical surface, a ring pipe and a hemisphere end surface. The container port sealing device provided by the invention has the characteristics that the seal is tight, the stability is strong, the protective property is good, the friction force is low, the adaptability is wide and the like, and has the advantages that the implementation is simple and the manufacture is easy. The product formed by the sealing device is beautiful and elegant in structure, is solid and durable, is convenient to use, and has a wide market space and a high added economic value.