The invention discloses a natural stone toning process, which comprises the following steps of: selecting stone containing metals, cutting into slabstone and drying; spraying oxidant solution on the surface of the slabstone, or soaking the slabstone by using the oxidant solution; heating the slabstone to the temperature of between 100 and 120 DEG C by adopting hot air, and keeping the temperaturefor 1 to 3 hours; reducing the temperature to 60-80 DEG C, and keeping the temperature for 1 to 3 hours; heating to the temperature of between 160 and 180 DEG C, and keeping the temperature for 1 to 3 hours; reducing the temperature to 100-120 DEG C, and keeping the temperature for 1 to 3 hours; heating to the temperature of between 240 and 260 DEG C, and keeping the temperature for 2 to 4 hours;and reducing the temperature of the slabstone by steps to normal temperature. The natural stone toning process completely overthrows the traditional stone toning process, makes the metals in the stone quickly oxidize and change color by adding the oxidant and repeatedly raising and reducing the temperature in short time to simulate the change of natural environment, makes the natural color changeprocess of the stone in thousands of years accelerated and completed in short time, and makes the stone have uniform and natural color with fastness.