Disclosed is an adjustable-distance type lamp. The adjustable-distance type lamp comprises a lamp holder, a lamp head and an electric wire. The lamp head is connected with the lamp holder. The lamp holder and the lamp head are connected through the electric wire. A circuit loop is formed by the lamp head and the lamp holder through the electric wire to be used for energizing the lamp. The end, close to the lamp holder, of the lamp head is provided with protruding clamping position parts. The end, close to the lamp head, of the lamp holder is provided with at least two clamping position pieces. A clamping position groove is formed between every two adjacent clamping position pieces. When the clamping position parts are contained in the clamping position grooves correspondingly, the lamp head and the lamp holder are mutually combined in a clamped mode. When the clamping position parts are separated from the clamping position grooves, the lamp head is separated from the lamp holder. According to the adjustable-distance type lamp, the requirements of the lamp for different tube depths can be met through buckling and separation of the clamping position parts and the clamping position grooves formed by the clamping position pieces. In addition, the structure is simple, and the material cost is reduced.