The invention relates to a precise surfacing welding method of high-hardness cold and hot rolls. The precise surfacing welding method comprises the following steps: (1) selecting die steel deposited metal components to prepare a surfacing alloy enabling the hardness of cold roll surfaces to be larger than 60 HRC for standby application; (2) cladding the covering surface of the alloy product after surfacing welding in the step (1) with metal components for standby application; (3) carrying out surfacing welding on the alloy product after surfacing welding in the step (2) with the preheating and interpass temperatures higher than 280 DEG C; and (4) carrying out high-temperature tempering on the alloy product after surfacing welding in the step (3), and carrying out secondary high-temperature tempering on cold-rolled working rolls with a higher demand for tenacity. The precise surfacing welding method is reasonable in conception and simple in operation procedure, the hard-face surfacing welding repairing or composite manufacturing of cold rolls and steel plate hot continuous rolling function rolls with high strength can be met, and the method is high in reliability and quality reproducibility.