The utility model discloses a snap ring installing device. The snap ring installing device is composed of a handle (1), an installing base (4) and a snap ring sleeve (5), the handle (1) and the installing base (4) are connected through a first short pin shaft (2) and a second short pin shaft (3), and the snap ring sleeve (5) is arranged at the non-connection end of the installing base (4) in a sleeving mode. The snap ring installing device is simple in structure, easy to operate and capable of finishing assembly within a reasonable deformation range of a snap ring and ensuring assembly quality.