Pre-separation system of settler coarse cyclone separator

The utility model relates to the field of crude oil catalytic cracking preparation, and particularly discloses a pre-separation system of a settler and a coarse cyclone separator. The device comprises a coarse cyclone separator, a steam stripping section and a riser reactor, and is characterized in that a catalyst pre-separation system is arranged between the coarse cyclone separator and the riser reactor and comprises a pre-separation pipe and a pre-separation blanking pipe; the pre-separation pipe comprises an upper horizontal section connected with the coarse cyclone separator and a lower horizontal section connected with the upper end of the riser reactor, the upper horizontal section and the lower horizontal section are connected through a vertical section, and the lower end of the pre-separation blanking pipe is connected with the steam stripping section. The running load of the coarse cyclone separator can be reduced, the running stability of the coarse cyclone separator is ensured, a catalyst is effec