Clamp spring capable of reducing dragging force of automobile hydraulic disc type brake and installing structure of clamp spring

The invention relates to a clamp spring capable of reducing dragging force of an automobile hydraulic disc type brake and an installing structure of the clamp spring. The clamp spring is characterizedby comprising high-low position clamping jaws, an S-shaped returning elastic force storage area, friction block returning auxiliary bending, friction block limiting bending and a friction block alarming structure. According to the clamp spring, the dragging force of the hydraulic disc type brake can be remarkably reduced, the dragging force can be reduced to be less than 0.8N.m under the action of the double-returning structure, the fuel economy of the automobile and the endurance mileage of the new energy automobile are further improved, and meanwhile, the manufacturing cost of a friction block is reduced; the friction block alarming structure of the clamp spring can be hung on the brake disc to generate alarm sound when the friction block is worn to the limit position, replaces the traditional alarming piece lo