The leaves of your snake plant yellowing  plant can turn yellow if it is exposed to too much direct sunlight. Depending on the degree of sunburn your plants may also develop brown or red margins. In this case, moving it to a spot with bright filtered light should help.

Overwatering is another common cause of yellowing snake plant leaves. Watering them too often causes the roots to rot and this, in turn, makes the leaves turn yellow. To prevent overwatering, only water the plant when the soil is dry down an inch or so. You can test the soil moisture by sticking your finger in it; it should feel moist to the touch.

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Snake plant leaves may also turn yellow due to a lack of essential minerals in the soil mix. Iron and other nutrients deficient in the soil will affect the plant’s chlorophyll production and cause it to turn yellow. If you notice this problem, fertilize the snake plant using a mild fertilizer during the growing season.

Fungal diseases like anthracnose can also turn snake plant leaves yellow. If you suspect a fungal infection, disinfect your shears or cutting tools with isopropyl alcohol or bleach to reduce the risk of spreading it to other parts of the plant.

You can also avoid fungal infections by using neem soil soaks or neem foliar sprays and watering the snake plant slowly so that the excess water does not drip down on the leaves. You should also avoid overfertilizing your snake plant as this can lead to yellowing.