The invention relates to a hot metal desulphurization device capable of saving desulfurizing agents and application thereof. The hot metal desulphurization device is located above a hot metal ladle containing hot metal and comprises a desulfurizing agent articulated chute composed of a fixed pipe and a movable pipe. The movable pipe is internally provided with a spiral flow component. The device further comprises a desulfurizing agent stock bin communicated with the fixed pipe and an air feeder connected with the fixed pipe through an air feeding pipe. The air feeder feeds clean air or non oxidative gas into the desulfurizing agent articulated chute, the desulfurizing agent stock bin conveys the desulfurizing agents to the desulfurizing agent articulated chute, the gas is mixed with the desulfurizing agents to form low-speed gas-solid two-phase flow rotating fluid through the spiral flow component, and the gas-solid two-phase flow rotating fluid makes full contact with the hot metal in the rotating state, so that the desulfurizing agents are effectively absorbed by the hot metal.