Portable energy storage power supply and power supply system

The invention provides a portable energy storage power supply and a power supply system. The portable energy storage power supply comprises a shell; the inverter is arranged in the shell; and an AC output interface and a DC output interface; the battery mounting part is arranged in the shell, is configured to be suitable for accommodating and mounting a detachable battery pack, and comprises an interface suitable for being mechanically and electrically connected with a power supply output port of the battery pack; the at least one battery pack is detachably and adaptively connected to the battery mounting part so as to be coupled with the inverter through mechanical and electric connection of the power supply output port and the interface; the AC output interface is only configured on the shell so as to invert DC current of the battery pack through an inverter coupled with the AC output interface and output AC current; and the DC output interface is only configured on the battery pack, and when the battery pa