The invention discloses a mounting and dismounting device for a wind driven generator coupler. The mounting and dismounting device comprises a carrying platform mechanism and a height adjustment mechanism, wherein the carrying platform mechanism is used for carrying the coupler to be mounted or dismounted; and the height adjustment mechanism is fixed below the carrying platform mechanism and used for adjusting the level of the carrying platform mechanism to facilitate mounting or dismounting of the coupler. The device has the advantages that the device is simple and compact in structure and convenient to use and operate, and can reduce working strength and risks, and the couplers in different specifications can be quickly and precisely mounted or dismounted.