The invention discloses a 5G array antenna nonlinear point measuring method for calibration. The 5G array antenna nonlinear point measuring method includes the following steps: S1, establishing a measurement model; S2, adjusting the initial phase of an array antenna, and making the total field strength of the array greater than twice the field strength of each antenna unit; S3, exciting all the antenna units of the array antenna to measure the array signal power; S4, sequentially exciting the antenna units corresponding to antenna ports, and measuring a transmission coefficient matrix of eachantenna port to a measurement port as priori information; S5, sequentially testing the array signal power of each antenna unit under the phase shift of 90 degrees and 180 degrees, and solving the normalized amplitude and the phase of each antenna according to the array signal power to acquire normalized expression of intermediate vectors; S6, according to the measurement model, calculating normalized data of real excitation vectors of the antennas as a measurement result. The 5G array antenna nonlinear point measuring method has the advantages that real excitation of the port of each antenna unit of the array antenna can be measured accurately, and an accurate basis is provided for the calibration of the 5G array antenna.