In order to quickly identify and isolate DC pole to pole fault and achieve fault fast recovery of multi-terminal DC distribution networks, a fault isolation recovery strategy based on DC breaker reclosing is proposed. The transient fault characteristics of a circular multi-terminal DC distribution network based on half bridge modular multilevel converter are studied. Then, combined with the typical protection configuration, fault line selection and control methods, a coordinated control and protection strategy based on reclosing of DC breaker is proposed. After the fast protections detect the fault, the inverters are blocked and DC breakers are tripped immediately to isolate the fault. When obtained the fault location information, the DC breakers that have been tripped in the non-faulty region are reclosed and the inverters that have been blocked are unblocked again by the control and protection system. The multi-terminal DC distribution network can recover rapidly under the new topology. Finally, a simulation model of six terminal flexible DC distribution network is built under the PSCAD/EMTDC software. The fault isolation and recovery characteristics of the poles are tested, and the feasibility of the proposed scheme is verified. This work is supported by National High-tech R & D Program of China (863 Program) (No. 2015AA050103).