The invention provides a turbine disc hole edge micro-chamfering measuring device and a measuring method thereof. The turbine disc hole edge micro-chamfering measuring device includes a convex matrix,wherein a measuring base is correspondingly arranged at the lower part of the convex matrix; a push rod is inserted in the middle part of the convex matrix; one end of the push rod is fixedly connected with the measuring base; the outer wall of the push rod sleeves a spring; one end of the spring is abutted against the convex matrix, and the other end of the spring is abutted against a block on the push rod; an indicating gauge is inserted on the convex matrix; the end surface, facing the convex part, of the measuring base, is equipped with a measuring pin and a measuring boss; a chamfering is arranged at the upper end of the measuring pin; and a measuring head of the indicating gauge contacts the measuring boss. The turbine disc hole edge micro-chamfering measuring device has the advantages of breaking through the influence of the semiclosed space, realizing quick and stable measurement of the micro chamfering, having practical application values, successfully solving the measuring problem, enabling the accuracy to satisfy the usage demand, being high in measuring efficiency, being convenient to use, being novel in structure, and being preferable in field feedback application. Besides, the measurement accuracy satisfies the process demand, and the measuring efficiency of components is improved, and the measuring result can reflect the real size of the components, thus being conductive to master of the product quality.