The invention relates to a brittleness evaluation method considering rock fracture complexity, and belongs to the field of rock brittleness evaluation. In order to solve the problems existing in the prior art, the invention provides a brittleness evaluation method considering the rock fracture complexity, which comprises the following steps: step A, collecting a rock fracture sample, and collecting basic parameters of rock; b, conducting normalization processing on the shear expansion angle, the Young modulus and the peak strain through the following formula; and C, evaluating the brittlenessof the rock core according to the obtained data and the following formula. According to the method, the brittleness characteristic of the rock can be relatively comprehensively represented.