The present invention provides a hybrid high voltage DC circuit breaker rapid mechanical switch dynamic voltage sharing test system which comprises multiple resistance-capacitance voltage dividers, a plurality of coaxial cables, and a signal processor. The high voltage end of the high voltage arm of each resistance-capacitance voltage divider is connected to the high voltage end of each vacuum arc extinguish chamber of a hybrid high voltage DC circuit breaker rapid mechanical switch, the lower voltage end of the low voltage arm is connected to a ground potential, and the resistance-capacitance voltage dividers are used for measuring a voltage signal to ground of the high voltage end of each vacuum arc extinguish chamber. The low voltage end of the high voltage arm and the high voltage end of the low voltage arm of each resistance-capacitance voltage divider are in an equipotential connection with one end of each coaxial cable, the other end of each coaxial cable is connected to the signal processor, and the coaxial cable is used for converting high voltage signals detected by the resistance-capacitance voltage dividers into low voltage signals and transmitting the low voltage signals to the signal processor. The signal processor carries out difference operation on the voltage of the high voltage end to ground of each vacuum arc extinguish chamber according to low voltage signals transmitted by the coaxial cables so as to obtain a voltage signal borne by a vacuum arc extinguish chamber between two adjacent resistance-capacitance voltage dividers at each time.