The invention provides a miniature grounding electrode adjustable power adapter to improve the user's comfort and the anti-shock safety index. The miniature power adapter with electric leakage alarming includes a housing, an AC to DC converter circuit, an AC electrode I, an AC electrode II, and an output pport composed of a USB output interface or a DC power interface. The power adapter also comprises a grounding electrode and a grounding electrode sliding groove which is arranged in the housing at a position between the AC electrode I and the AC electrode II. The grounding electrode can be horizontally placed in the grounding electrode sliding groove or rotatably and vertically arranged in the grounding electrode sliding groove, and the grounding electrode can slide in the grounding electrode sliding groove along the groove to adjust the relative position between the AC electrode I and the AC electrode II. With the power adapter, the leakage current of the power adapter and the dangerous current at the output port in the faulty state can be effectively grounded through the grounding electrode, so as to improve the comfort and safety of the mobile terminal.