A high-purity germanium detector (100), comprising a high-purity germanium crystal unit array, the high-purity germanium crystal unit array comprises two or more high-purity germanium crystal units (101), each of the two or more high-purity germanium crystal units (101) comprises a partial electrode located on a side face (101c) and/or a first top surface (101a), and the electrodes on the side faces (101c) and/or the first top surfaces (101a) of the two or more high-purity germanium crystal units are electrically connected and commonly function as a first contact electrode of the high-purity germanium detector (100); each high-purity germanium crystal unit (101) comprises a respective second contact electrode located therein, enabling the high-purity germanium detector (100) to have two or more second contact electrodes.
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