The invention relates to a melting cone optical fiber opposite-direction cross coupling external-cavity semiconductor laser, which belongs to the semiconductor laser field, and comprises a semiconductor laser array (1), a fast-axis collimating lens (2), an aligning fixed sleeve (3), a melting cone optical fiber coupler (4) and an output fixed sleeve (5). In the invention, a semiconductor laser iscoupled to optical fiber beams by adopting a method that the luminescence units of the semiconductor laser array are in one-to-one correspondence with optical fibers, and the laser beams are coupled by adopting the method of optical fiber bundle melt pull cone, so as to improve the coupling efficiency. The optical fiber beams are divided into two parts which are arranged in the opposite directionin a cross manner and the coupled light directly enters the corresponding luminescence unit, therefore the laser has the advantages of eliminated external-cavity feedback lens, simple structure and lower feedback loss.