Bidirectional DC-DC converter and energy-saving elevator

The utility model provides a bidirectional DC-DC converter and an energy-saving elevator. The bidirectional DC-DC converter comprises a high-voltage pre-charging module, a buck-boost module and a low-voltage pre-charging module which are connected in sequence, the high-voltage pre-charging module is used for being connected with an external high-voltage end and preventing a large-current peak during power-on; the boost-buck module comprises a multi-phase interleaving parallel conversion circuit, and the multi-phase interleaving parallel conversion circuit is used for carrying out boost-buck bidirectional conversion to realize bidirectional flow of direct-current electric energy; and the low-voltage pre-charging module is used for being connected with an energy storage device, preventing overlarge current peak during power-on and performing overvoltage protection on the multi-phase interleaving parallel conversion circuit. Through the multi-phase interleaving parallel conversion circuit, the capacity of a filt