The utility model relates to a cable branch box, comprising a box body and three groups of cable connectors arranged on the box body. Each group of cable connector comprises three interconnected cable connectors, and each cable connector is provided with a handling device. The cable branch box on column is provided with three cable connectors, which has compact structure, small volume, and the cable branch box can be installed on the column easily. The silicon rubber straight plug of shielding type can be rapidly inserted and pulled when power is on, which has convenient installation and maintenance, and provides convenience for the urban network construction and the harmonization design of the environmental planning. The material of the silicon rubber plug has the characters of high elasticity, high density, complete insulation and hydrophobicity etc, making the cable joint have the advantages of age resistance, flame-proof resistance, corona resistance, water-proof and moisture-proof property and extended service etc.