Cooling fan of wind turbine generator

The utility model discloses a wind turbine generator cooling fan which comprises a machine body and an installation base, the installation base is arranged on the front face of the machine body, a protective cover is fixedly arranged in the middle of the front face of the installation base, installation grooves are formed in the four corners of the inner wall of the front face of the machine body, installation columns are fixedly connected to the four corners of the back face of the installation base, and the installation columns are fixedly connected with the machine body. The mounting grooves are matched with the mounting columns in size, springs are fixedly connected to the middles of the inner walls of one sides of the mounting grooves, one ends of the springs are in contact connection with the mounting columns, limiting grooves are formed in the middles of the top ends of the four mounting columns, and limiting pins are connected to the middles of the inner walls of the tops of the mounting grooves in a