This paper experimentally measures and analyzes the power generation and operating noise of a 25 kW horizontal axis wind turbine. The measurement method is based on the IEC61400-11 measurement standard, and uses CESVA's SC310 handheld acoustic noise meter to record the 1/3 octave sound characteristics and average sound noise per second of the 25 kW wind turbine. The measurement method also uses full-frequency noise recording and analyzes ground acoustic noise through FFT conversion. The results show that when the blade pitch angle is adjusted to a standby position of 80 degrees, the average wind speed is increased by 8.5 m/s from 2.5 m/s, which will increase the background full-frequency noise from 49 dB(A) to 57 dB(A). When operating at the lowest blade pitch angle of 5 degrees, the aerodynamic noise measured by the ground under high-speed wind conditions is slightly increased by 1 dB(A) compared with the noise of the standby state. At high wind speeds, the low frequency noise is 44.48 dB(A) and 51.78 dB(A) at the pitch angles of 80 degrees and 5 degrees, respectively. The FFT spectrogram results show that the acoustic frequency is significantly different at 180 Hz, 320 Hz, 560 Hz and 580 Hz under the variation of the pitch angle. In terms of power generation, the lower pitch angle exhibits higher rotational speed and power generation at the same wind speed. The maximum operating efficiency and power generation at a pitch angle of 5 degrees at a wind speed of 9.24 m/s are 28.81% and 17 kW, respectively. At a pitch angle of 45 degrees, the maximum operating efficiency and power generation at a wind speed of 7.18 m/s are 2.08% and 580 W, respectively. The power generation power at a pitch angle of 5 degrees is about 1.5 times higher than the power generated by a pitch angle of 15 degrees, but the generated aerodynamic noise exhibits similar values.