The invention relates to a device for strengthening cooling and quenching through injection convection and a method thereof. The device comprises an electric heating furnace, a workpiece lifting mechanism, an adjustable porous jet pipe and an adjusting mechanism for a jet space position generated by the adjustable porous jet pipe, wherein the mechanism comprises a porous jet pipe, a pipe positioning ring, a ratchet wheel positioning device, a telescopic pipe and a flexible water pipe, also comprises a divisional water tank and a water pump. The method utilizes high-energy water flow generated by the porous jet pipe to destroy a steam film formed by rapid heat release on the surface of a workpiece to be processed in the quenching process, leads the workpiece to be in good contact with the cooling water all the time, accelerates the flow velocity of the cooling water, improves the heat exchange efficiency between the workpiece and the cooling water, leads the workpiece to be quickly cooled to achieve the purpose of solid-solution treatment, is beneficial for the full play of the properties of aluminum matrix composite and further improves the comprehensive mechanical properties. The advantages of the invention are as follows: the device with simple principle, simple design and strong adaptability not only can be used for quenching treatment of the workpieces with different shapes and sizes but also can achieve the rapid cooling effect.