The invention relates to a fixed-point sleeve throwing device. The fixed-point sleeve throwing device is characterized in that a final-stage sleeve and a drilling rod are connected to form a sleeve casing assembly through a connecting sleeve, a connector body and a connector; after the device is downwards fed to a preset position in a well following the sleeve, a throwing ball is thrown from a ball throwing position into the connector body, the throwing ball and the inner conical face of the connector body are sealed, a slurry channel is blocked, under high pumping pressure, slurry enters a piston cylinder through a piston cylinder passage on the connector body to drive a piston to move so as to enable the connecting sleeve and the sleeve to be disconnected from the connector body, and therefore the purpose of throwing the sleeve off is achieved.