The invention discloses a down-hole jet type garbage recycling device and a working method thereof. The down-hole jet type garbage recycling device comprises a negative pressure generation jet flow mechanism, a filter mechanism, a garbage flow dividing mechanism and a falling object drainage recycling mechanism connected in sequence, and the negative pressure generation jet flow mechanism comprises a joint, a jet flow outer barrel, a nozzle, a nozzle body, a ball seat, a steel ball and a lock key. The down-hole jet type garbage recycling device and the working method thereof only need to add a seal ball at the well mouth to realize the casing pipe cleaning and under-hole falling object salvage, and strong vacuum is manufactured through flow rate control to suck liquid and fragments into a salvage barrel; the down-hole jet type garbage recycling device is simple in structure, the scraping is difficult to be blocked, and all the large falling objects and down-hole garbage can be taken out to recycle.