The invention discloses a device for continuously preparing short fiber and metal powder mixed powder and belongs to the field of powder metallurgy. The device is composed of a powder mixing system, ashort fiber discharging system, a metal powder discharging system and a powder recycling system, wherein the powder mixing system comprises a conical swirler and an auxiliary gas flow pipe arranged on the conical swirler and communicating with the conical swirler; the short fiber discharging system is connected with the top of the conical swirler, and stretches into the conical swirler, and a gate valve is arranged between the short fiber discharging system and the conical swirler; the metal powder discharging system is connected with the bottom of the conical swirler; and the powder recycling system is connected with the upper portion of the side wall of the conical swirler. According to the device, powder is sucked into a pipeline due to negative pressure, gas performs material mixing in a swirling manner, and the short fiber and metal powder mixed powder is obtained due to supercharging and deposition. Continuous gas flow performs lasting feeding so that the mixed powder can be continuously prepared, damage of short fibers is avoided, it is avoided that the short fibers and the metal powder are separated again during negative pressure deposition, and the production efficiency is improved.