The invention discloses a manufacturing method of insulating gloves. For each insulating glove, the manufacturing method comprises the following steps: (1) vulcanization-molding silica gel; (2) spraying a refractory fiber layer outside a silicone rubber layer; (3) spraying an insulating material; and (4) sticking a protective layer. The insulating gloves, which are manufactured by the method, are beautiful and practical, light in weight, highly resistant to voltage, good in insulating performance, resistant to acid and base, resistant to high temperature, easy for storage and safe and reliable.