The invention discloses a distribution-grid-reconstruction-based optimal power flow calculation method for an integrated communication energy system (ICES). The system comprises: establishing an integrated communication energy system mathematic model; establishing an optimal mixed power flow mathematic model of the integrated communication energy system; invoking IBM ILOG GPLEX software by using an MATLAB software system and solving an established objective function and the formed optimal mixed power flow mathematic model of the integrated communication energy system by using an alternate iteration solution method; and then generating optimal operation power instructions of a combined heat and power unit, a central air-conditioning system, and a gas-fired boiler in all energy centers. According to the method disclosed by the invention, related constraints of a three-phase unbalanced distribution network, a gas pipe network, and an EC in an ICES are taken into consideration by starting from source-network-load full links and the potential of the network link in multi-energy supply cost reduction is exploited, so that flow distribution of the distribution network as well as the power supply capability of the distribution network can be improved and the operating cost of the ICES can be reduced effectively.