The portable energy storage power bank has a simple and generous appearance, stable frame, and complete protections; Capable of overcurrent protection, overvoltage and undervoltage protection, emergency stop protection, PWM abnormal protection, abnormal connection protection, and other protections, it is suitable for automobile repair shops, charging station operators, families and other places requiring emergency and rescue charging. It is an efficient portable energy storage and charging device that provides power supply for new energy vehicles with on-board AC charger.