This paper focuses on integrated comparative research on performance and economic usefulness of three typical topologies for DC de-icing equipment, including uncontrolled diode rectification integrated with adjustable rectiformer, thyristor-based half controlled rectifier, and insulated gate bipolar transistor (IGBT)-based full controlled rectifier. The operation principles of three topologies for DC de-icing are analyzed, and the rectifier models of the three topologies are established, then the comparative research on the performances for three topologies, including rectifier performance, characteristics of harmonic and reactive power, power loss, economic cost, and extended function, is carried out. Furthermore, the simulations for three topologies to realize DC de-icing for a transmission line are done to verify the contrastive analysis results. Some conclusions are obtained. First, uncontrolled diode rectification has advantages on simple structure, low cost, easy to realize, and simply maintenance, so this topology is appropriate to be applied to DC de-icing of large capacity and long distance transmission line. Second, thyristor-based half controlled rectifier can smoothly regulate the output DC melting-icing voltage, and it can be expanded to Static Var Compensator (SVC), so it can be applied to DC de-icing of transmission line with the demand of reactive power compensation. IGBT-based full controlled rectifier has advantages on strong regulation ability of output voltage, and it can be used as power quality regulator when no icing. But it has the weakness of high cost, complicated control, and relatively low reliability. So it is preponderant for DC-icing of low capacity and short distance transmission line. Research conclusions are very significant to provide references for selection and design of DC de-icing engineering equipments.