Single-tube semiconductor laser beam combining device

The invention discloses a single-tube semiconductor laser beam combining device. The device comprises a frustum-shaped heat sink, single-tube semiconductor lasers, fast-axis collimators, slow-axis collimators, a focusing lens set and a multimode fiber. One side, which is next to a first end surface, of the frustum-shaped heat sink is provided with a plurality of troughs. The plurality of troughs are arranged around the side surface of the frustum-shaped heat sink. A single-tube semiconductor laser is fixed in each trough. The fast-axis collimator and the slow-axis collimator are successively fixed in front of each single-tube semiconductor laser. The optical path of a plurality of combined laser beams which are transmitted from the plurality of single-tube semiconductor lasers is provided with the focusing lens set. The optical path of a focused laser beam which is obtained behind the focusing lens set is provided with the multimode fiber. The single-tube semiconductor laser beam combining device has advantag