Automatic collecting device for waste grease of variable-pitch bearing of fan

The utility model provides a fan variable pitch bearing waste grease automatic collecting device which comprises a bottle body screwed with a bottle cap, an anti-backflow cover is arranged on the inner side of the bottle cap, a flow guide pipe used for being connected with a grease discharging hole of a bearing seat in a screwed mode is arranged on the bottle cap in a penetrating mode, a guide rod is arranged on a connecting block at the inner end of the flow guide pipe, and the guide rod is slidably connected with a sliding block in a sleeved mode. A connecting rod on the sliding block extends into the flow guide pipe, and a grease scraping ring is arranged at the end of the connecting rod. The bottle body is locked on the bearing seat through screwing of the flow guide pipe and the grease discharging hole, when the bottle body rotates along with the bearing seat, the sliding block reciprocates along the guide rod under the action of gravity and drives the connecting rod and the grease scraping ring to synch