The invention discloses a communication power direct current supply system. The system comprises a direct current voltage module which is connected with a DC/DC direct current conversion module and is used for supplying a 220V direct current voltage to the DC/DC direct current conversion module; the DC/DC direct current conversion module which is connected with a load in parallel and is used for converting the 220V direct current voltage into a 50V direct current voltage and outputting the 50V direct current voltage to the load; the load; a storage battery module which is connected with the load in parallel; and a communication power supply module which is connected with the storage battery module in parallel. According to the system, the technical problem of consuming funds and space due to addition of a set of backup communication power and storage battery when faults occur in the communication power and the storage battery of the communication power direct current supply system at the same time in the prior art is solved.