High-Voltage Direct Current transmission based on Modular Multilevel Converter (MMC-HVDC) has gained a lot of attention because of its significant advantages, such as low switching frequency, low operation loss, modular structure and so on. The DC side short-circuit fault has caused serious trouble for the development of MMC-HVDC because of its large short-circuit current, fast rise rate of fault current and difficult suppression. A DC side short-circuit fault ride-through control method for MMC-HVDC is proposed. The method is based on a full-bridge MMC-HVDC with symmetrical bipolar connection, and adopts high-resistance grounding and metal return lines on the DC side. When a DC side short-circuit fault occurs, the full-bridge module multilevel converter is used to reverse, in a timely fashion, the polarity of the output DC voltage to realize fault current suppression. At the same time, a new power loop is constructed using the metal return lines, and the active power transmission during the fault period is quickly restored. The proposed fault ride-through strategy can effectively eliminate the fault voltage and current stress of the converter equipment when the MMC-HVDC system is short-circuited on the DC side, and at the same time avoids converter blocking and power loss. Finally, PSCAD/EMTDC simulation is used to verify the effectiveness of the proposed DC side short-circuit fault ride-through control method. This work is supported by National Natural Science Foundation of China (No. 2018YFB0904500).