In order to avoid the problems of abnormal mine pressure and support crushing during the fully-mechanized caving mining of No.13 extra-thick coal seam in Sunjiagou Mine, taking the first mining area as the engineering background, the characteristics and control measures of mine pressure in the fully-mechanized caving face under the influence of the remaining coal pillars in the upper goaf are studied. The research shows that when the fully-mechanized caving face of extra-thick coal seam enters and leaves the coal pillar of the upper goaf ±15 m, the peak value of the abutment pressure of the working face increases rapidly, and the peak value of the abutment stress reaches 1.78 times during the normal pressure period when the coal pillar is removed, and there is a large risk of support crushing. Both the accelerated advancing speed and the coal pillar left by blasting can improve the stability and self-bearing capacity of the overlying rock structure during the coal pillar passing, and reduce the risk of support crushing in the working face. The research results can provide guidance for roof management and strata control in fully mechanized caving face.