Strengthened glass and manufacturing method therefor

A manufacturing method of a strengthened glass, comprising following steps:

• step S1, coating a partial region of a glass to be strengthened with a high temperature-resistant protective coating, and subjecting the protective coating to curing;
• step S2, placing the glass to be strengthened into a first ion exchange salt bath for an ion exchange;
• step S3, taking out the glass to be strengthened from the first ion exchange salt bath, and washing the glass to be strengthened;
• and
• step S4, removing the protective coating on the glass to be strengthened;
• wherein the protective coating is used to prevent or hinder the partial region of the glass to be strengthened from ion exchanging in the first ion exchange salt bath;
• wherein the strengthened glass comprises a first surface and a second surface with a spacing of t;
• a difference between thicknesses in different regions of the strengthened glass is greater than or equal to 0.04 mm;
• wherein the strengthened glass comprises a surface compressive stress layer formed by an ion exchange method on its surface, wherein a distribution of an internal tensile stress in different regions of the strengthened glass are different;
• an absolute value of a difference between maximum values of the internal tensile stress in different regions of the strengthened glass is smaller than or equal to 368 MPa.