The invention discloses a sensor array for turbulent boundary layer fluctuating pressure test of a complex interface, which relates to the technical field of turbulent excitation test. The sensor array comprises a predetermined number of MEMS sensors with bottom entry sound, a flexible circuit board and a steel sheet. The flexible circuit board comprises an element surface and a soldering surface,wiring is arranged on the element surface and the soldering surface, and components are arranged on the element surface. Each MEMS sensor is soldered to an element surface of a flexible circuit boardaccording to a predetermined position of the circuit design, and a first sound inlet hole corresponding to a bottom sound inlet hole of the MEMS sensor is arranged on the flexible circuit board; Thesteel sheet is fixed on the soldering surface of the flexible circuit board, and the steel sheet is provided with a second sound inlet hole corresponding to the sound inlet hole at the bottom of the MEMS sensor. Surface smoothing model interface is realized by oneself, which is advantageous to error control.