The present work investigates the relation between large-scale coherent structures in the vicinity of turbulent/non-turbulent interface and corresponding pressure fluctuations within the turbulent boundary layer (TBL) close to the trailing edge of the NACA0012 airfoil. The planar particle image velocimetry (PIV) measurements were conducted to capture the instantaneous velocity fields, with simultaneous wall-pressure fluctuation measurement obtained by miniature transducers. Based on the identifications of high amplitude pressure peaks (HAPPs) in the pressure signal, the corresponding simultaneous measured velocity fields are conditionally averaged, revealing the dominance of high-speed large-scale motions (LSMs). The simultaneously measured pressure fluctuations are conditionally extracted based on the occurrence of low- and high-speed LSMs. Results show that high-speed LSMs induce high-energy positive pressure fluctuations, especially when located upstream of the reference wall pressure transducer. The correlation analysis between various scale velocities acquired by empirical modal decomposition (EMD) and the reference pressure signal is conducted. It is demonstrated that upstream high-speed motions with sweeps accompanied by downstream low-speed motions with ejections are responsible for the positive pressure fluctuations, while the negative pressure fluctuations are attributed to the adverse arrangement. It is also observed that the sourced coherent structures of pressure fluctuations can expand outside the TBL, with significant momentum exchange across the turbulent/non-turbulent interface (TNTI).