The invention belongs to the technical field of materials and particularly discloses tempered glass and a manufacturing process thereof. The tempered glass comprises a tempered glass substrate and an explosion-proof layer. The tempered glass substrate comprises, by weight, 20-60 parts of silicon dioxide, 10-15 parts of limestone, 3-5 parts of borax, 5-8 parts of calcium carbonate, 10-16 parts of feldspar, 3-8 parts of bauxite, 5-13 parts of calcium silicate, 2-5 parts of sodium oxide, 2-4 parts of lithium oxide, 4-8 parts of bismuth oxide, 7-9 parts of aluminium sesquioxide, 1.5-2.5 parts of macrogol ester, 3-7 parts of copper sulfate pentahydrate, 5-11 parts of potassium permanganate, 3-6 parts of sodium hydroxide and 2-6 parts of a clarifying agent; the explosion-proof layer is composed of, by weight, 15-30 parts of polyvinyl alcohol, 30-60 parts of butyraldehyde, 15-30 parts of hydrochloric acid, 8-12 parts of plasticizer and 6-9 parts of an additive. According to the tempered glass and the manufacturing process thereof, a PVB middle membrane is additionally arranged between two layers of tempered glass, good binding power is achieved for inorganic glass, possibility of spontaneous explosion of the tempered glass can be effectively reduced, and the performance of the prepared tempered glass is far superior to conventional tempered glass.