The invention discloses a tube-cone connected body hydrocyclone without a traditional overflow pipe, belongs to the technical field of material classifying and desliming and particularly relates to material classifying and desliming equipment. The tube-cone connected body hydrocyclone comprises an outer overflow pipe, an outer overflow riser, a pulp inlet pipe, a tube-cone connected body, a sand settling cape nut and a sand settling cape; a tube body and a cone body are connected to form an integrated assembly; an arc-shaped transition surface is formed at the crossed part of the inner sides of the tube body and the cone body. According to the tube-cone connected body hydrocyclone, intense turbulence caused by a groove in a tube-cone combined part of the traditional cyclone can be eliminated, and the energy entering a cone centrifugal force field can be enhanced; in addition, by virtue of overflow columns formed by the hydrocyclone, the adverse effects caused by the traditional overflow pipe are eliminated, and the classification efficiency can be enhanced greatly.