The invention relates to a T-shaped elastic valve seat sealing structure of a V-shaped adjusting ball valve. The T-shaped elastic valve seat sealing structure comprises a valve body, a pressing ring, a supporting rind, a first metal graphite ring, a T-shaped elastic valve seat, a second metal sealing ring and a valve ball, the T-shaped elastic valve seat is mounted between a second metal graphite ring and a first metal sealing ring, the supporting ring and the pressing ring are sequentially mounted on the valve body laterally, the pressing ring presses the supporting ring tightly to enable the T-shaped elastic valve seat and the valve ball to be matched to form a sealing pair, the second metal graphite ring is mounted in a step hole of the valve body, and the first metal graphite ring is mounted on a step shaft of the supporting ring to form an axial sealing structure. Invalid sealing caused by displacement and coming-off of the graphite rings can be avoided even if the T-shaped elastic valve seat sealing structure works for a long term under a pressed state; the T-shaped elastic valve seat sealing structure can fit with a sealing face of the valve ball by utilizing own elasticity, so that spherical wear is reduced; working stability of the V-shaped adjusting ball valve at high temperature can be improved, and safe and efficiency running of the V-shaped adjusting ball valve is guaranteed.