The invention relates to the technical field of ink, in particular to non-toxic ink. The non-toxic ink comprises the following raw materials in parts by weight: 30-50 parts of water, 10-20 parts of ethanol, 5-10 parts of a plant pigment, 4-8 parts of castor oil, 2-5 parts of peach gum, 1-2 parts of alkyl glycoside, 1-4 parts of polysorbate, 3-7 parts of nanometer medical stone powder and 0.5-2 parts of nanometer graphene. The non-toxic ink is bright, smooth and durable in color and stable in performance, is unlikely to fade, does not block a nib, is safe, environment-friendly and non-toxic, and does not cause harm to a body.