Based on the technical framework of SDN and NFV, the electrical 5G network slicing scheme was designed for the scenarios of large-scale acquisition service, low-delay power industrial control service, mobile large-bandwidth patrol service, etc., so as to meet the differentiated demands of electrical multiple services. The mapping model of electrical service demand onto communication and computing resources of network slices was established, and the mechanism and transformation between them are revealed. Constrained by the transmission bandwidth, time delay and computing resource demand of the electrical multiple services, the economical efficiency optimization problem of electric 5G multi-service network slice is formulated. A joint allocation algorithm of communication and computing resources is proposed to address the issue of efficient and economic resources utilization.