The invention provides a medium voltage cable network networking method. The method comprises the steps that 1, a 10KV bus of two substations or different 10KV buses of the same substation in the same power supply area are used as a power supply, wherein lines contact with each other to form a looped network and carry out open-loop operation; 2, a contact normally open point is arranged at each looped network point; and 3, two contact normally open points of each line are arranged in different ring main units, and a contact normally open point in the middle of the line is arranged at the halving point of a line load. When a cable network provided by the invention is in normal operation, each line load is connected with the accessed bus. When a fault occurs, the contact normally open points of the looped network points on both sides of the fault point carry out fault isolation. A load in front of the fault point is connected with an originally accessed bus. A load behind the fault point is connected with a bus which accesses a group line. In a high-reliability power supply area, if a medium voltage cable network networking method is unable to transit to a standard double looped network, the power supply reliability can be improved through the networking method provided by the invention.