The invention discloses a high-pressure low-temperature spark plasma sintering (SPS) quick preparation method of high-hardness high-conductivity CuCr25 alloy. The method comprises the steps that CuCr alloy powder is prepared through a mechanical ball milling method, and the raw material powder Cu and the raw material powder Cr are put into a ball milling tank with the mass ratio being 3:1; vacuumizing is conducted till the pressure is 0.1 Pa, ball milling is conducted, the ball milling rotating speed is 60-100 r/min, and the ball milling time is 5-6 h; the alloy powder is subjected to vacuum drying and then subjected to SPS, the sintering pressure is 100-300 MPa, the sintering temperature is 500-600 DEG C, and heat is preserved for 5-10 min at the highest temperature; and after a sample is cooled to the room temperature and milled slightly, the finished product is obtained. According to the high-pressure low-temperature SPS quick preparation method of the high-hardness high-conductivity CuCr25 alloy, the CuCr25 alloy mixed powder is prepared through the mechanical ball milling method, and ultralow-temperature ultrahigh-pressure sintering of the CuCr25 alloy is achieved through the SPS technology; by means of the high-pressure low-temperature SPS quick preparation method, the CuCr alloy which is high in compactness and excellent in mechanical property can be prepared; and compared with existing methods, the preparation method has the advantages of being simple in preparation process, capable of reducing energy consumption and environment pollution and superior in performance.