The invention relates to the field of water pumps, in particular to a pressurized anti-reflux water pump which comprises a water pump body, an inlet and outlet mechanism, an inlet pipe, a discharge pipe, an anti-reflux mechanism, a placement barrel, a sealing plug, a sealing ring, a blocking rod, an inner frame, a limiting rod, a sliding block, an exhaust mechanism, an exhaust pipe, an air plug, an abutting rod, a connecting block, a first spring, an air guide rod, a floating ball and a filtering mechanism. After water enters the inlet pipe, due to the impact force of water flow, the bottom end of the blocking rod can be extruded and pushed, at the moment, the blocking rod can slide in the inner frame and is gradually lifted, at the moment, the water flow can flow into the inlet pipe in the water pump main body from the opened notch and is finally discharged through the discharge pipe, and after the water pump main body stops working, the blocking rod can slide in the inner frame. When the water pump is used, due to the fact that the blocking rod is not impacted by water flow any more, the blocking rod can fall mainly under the action of gravity to block the notch in the inlet pipe again, and therefore the situation that water stored in the water pump body flows back can be prevented when the water pump is used, and inconvenience in use is avoided.