Abstract: A test bench for wind turbines, comprising a test bed (1) on which the assembly (6) to be tested is mounted, and load application means for applying loads on said assembly. The assembly (6) to be tested is mounted on the foundation through a cylindrical support (5), provided with an upper rotary flange, which can be operated by means of a series of geared motors. The load application means comprise a fixed structure (7) anchored to the foundation, a mobile structure (8) which is anchored to the assembly (6) to be tested and a series of actuators (9) relating the mobile structure (8) with the fixed structure (7).