A production method of glass base plate for recording device is characterized by that it uses any alkali-free metal-glass whose Young modules is greater than 60 GPa/sq.cm, specific weight is less than 2.8g/cu.cm and glass softening temp. is above 800 deg.C, and makes it undergo the process of float method or descent method for forming and annealing to obtain thin glass plate with supersmooth surface, high accurate size and thickness of 0.7-1.3 mm, then cutting, edging and chamfering so as to obtain the invented glass base plate. It possesses the advantages of high mechanical strength, high-temp. film-forming, simple preparation process and low cost.