Y?type composite joints with different inclination angles are prefabricated in granite specimens using the splitting method， and uniaxial compression experiments are conducted. The effects of the inclination angle of the composite joint on the failure mode， peak strength， surface deformation field， and acoustic emission energy release characteristics are analyzed， and the failure mechanism under different failure modes is explored. The experimental results show that： 1） Rock with Y‐shaped composite joints exhibit three main failure modes： overall failure， wedge ejection failure， and failure along the main joint surface， which vary with joint inclination； 2） The angle of composite joints and the inclination angle of main joints have a negative correlation with rock strength； 3） When the failure mode transitions changes from overall failure to ejection failure and failure along the main joint， the concentrated slip deformation zone shifts from the secondary joint to the main joint， and the high‐energy AE events induce a transition from the main and secondary joint compaction and slip dislocation to the main joint compaction and slip dislocation； 4） As the inclination angle of the main joint increases， the energy released on the main joint surface is higher and the distribution of energy is more uneven.
