The invention discloses a silicate steel rust prevention method, which is used in the post-processing process of steel parts and belongs to the technical field of metal material surface processing. The pH value of antirust liquid consisting of 5g/L to 20g/L of sodium silicate or potassium silicate, 5ml/L to 20ml/L of H2O2, 8g/L to 20g/L of NaNO3, 25g/L to 45g/L of Zn(NO3)2, 3ml/L to 15ml/L of H2SO4 and the balance of H2O is regulated by concentrated H2SO4 or NaOH solution to 1.50 to 3.0, a steel part processed by a derusting process, a deoiling process and the like is then taken out, and is put into the antirust liquid after being washed, the steel part is immersed under the room temperature for 15 to 30 seconds, and after being taken out and washed by tap water, the steel part is blown dry by a blower. After the steel part is processed by the rust prevention technique, the corrosion resistance of the steel part can be remarkably enhanced, and moreover, the rust prevention method has the advantages of no toxic substances, stability, reliability, excellent product performance and low production cost, belongs to a clean, environment-friendly, economic and practical rust prevention technique, and has important social significance and application value.