In order to study the strength characteristics and failure mechanism of fissured rocks under biaxial cyclic compression, taking Zheduoshan metamorphic sandstone as the reference object, orthogonal design of sandstone like sample mix proportion was carried out based on the principle of similarity, and samples with different dip angles and crack lengths were prepared. Based on theoretical analysis, indoor tests and PFC2D numerical simulations were conducted to study the strength characteristics and failure mechanism of rock-like materials with crack under biaxial conventional loading and biaxial cyclic loading and unloading conditions. The results show that cracks are an important factor affecting the strength of rock masses. As the length of cracks increases and the inclination angle of cracks approaches 45°, the peak stress of the sample will gradually decrease. The peak stress of the sample under cyclic loading and unloading conditions is smaller than that under conventional loading, and lateral pressure can also improve the peak strength of the sample under external loading. The connection modes of fractured rocks under biaxial loading can be divided into three types: tensile connection, shear connection, and tensile-shear composite connection, and the penetration modes are affected by the inclination angle of the fissure, with tensile penetration mainly occurring at inclination angles of 0°-30°, tensile-shear composite penetration occurring at angles of 45°-60°, and shear penetration mainly occurring at 90°.