The invention relates to a sample for testing high-temperature shearing intensity of a composite material and a method thereof, which belong to the field of high-temperature mechanical properties testing of the composite material. A first notch and a second notch are respectively and horizontally arranged on an in-plane shearing sample close to an upper end and a lower end, the first notch and thesecond notch pass through a thickness direction of the sample, lengths of the first notch and the second notch are greater than half width of the sample, roots of the first notch and the second notchare in a straight square shape, the first notch and the second notch are anti-symmetric by relating to the sample, a notch 1 and a notch 2 are respectively and horizontally arranged on an interlayershearing sample close to the upper end and the lower end, the notch 1 and the notch 2 pass through a width direction of the sample, the lengths of the notch 1 and the notch 2 are greater than half thickness of the sample, roots of the notch 1 and the notch 2 are in the straight square shape, and the notch 1 and the notch 2 are anti-symmetric by relating to the sample. the in-plane or interlayer shearing sample is loaded according to constant displacement until the sample is fractured, and the high-temperature shearing intensity of the in-plane or interlayer shearing sample composite material is calculated by using a shearing formula. The sample is used for testing the high-temperature shearing intensity of the composite material.