A calibration system for array antenna transmission links, which comprises multiple transmission links, and each transmission link comprises an array transmitter, n power amplifiers, n uplink and downlink signal separating apparatuses, and n antenna units, the array transmitter, the n power amplifiers and the n uplink and downlink signal separating apparatuses are placed in a base station, an output of a base band signal processing module is inputted into the array transmitter, n channels of signal are transmitted by the array transmitter, after going through the power amplifiers and uplink and downlink signal separating apparatuses, the n channels of signal are transmitted through the antenna units, the calibration system further comprises: a power detecting signal separating apparatus, a power detecting signal feeder apparatus, a power detecting apparatus, a signal synthesizing apparatus and an array calibration apparatus; wherein the power detecting signal separating apparatus receives an RF signal from the uplink and downlink signal separating apparatuses, filters out a DC signal from the RF signal, and transmits a filtered RF signal of high frequency to the power detecting signal feeder apparatus; the power detecting signal feeder apparatus is configured to transmit the high frequency RF signal outputted by the power detecting signal separating apparatus; the signal synthesizing apparatus coupled with the n antenna units is configured to synthesize the filtered high frequency RF signal from the power detecting signal feeder apparatus and output the synthesized RF signal to the power detecting apparatus; the power detecting apparatus is configured to detect a power of a synthesized RF signal coming from the signal synthesizing apparatus, and output a feedback power signal to the power detecting signal feeder apparatus; the power detecting signal feeder apparatus is further configured to mix the feedback power signal outputted by the power detecting apparatus and the filtered high frequency RF signal, and transmit a mixed signal to the power detecting signal separating apparatus; the power detecting signal separating apparatus is further configured to recover the feedback power signal from the mixed signal from the power detecting signal feeder apparatus, adjust a calibration weight, and transmit an adjusted calibration weight to the array calibration apparatus; the array calibration apparatus placed between the base band signal processing module and the array transmitter is configured to calibrate the array antenna transmission links according to the adjusted calibration weight. a power detecting signal separating apparatus, a power detecting signal feeder apparatus, a power detecting apparatus, a signal synthesizing apparatus and an array calibration apparatus; wherein the power detecting signal separating apparatus receives an RF signal from the uplink and downlink signal separating apparatuses, filters out a DC signal from the RF signal, and transmits a filtered RF signal of high frequency to the power detecting signal feeder apparatus; the power detecting signal feeder apparatus is configured to transmit the high frequency RF signal outputted by the power detecting signal separating apparatus; the signal synthesizing apparatus coupled with the n antenna units is configured to synthesize the filtered high frequency RF signal from the power detecting signal feeder apparatus and output the synthesized RF signal to the power detecting apparatus; the power detecting apparatus is configured to detect a power of a synthesized RF signal coming from the signal synthesizing apparatus, and output a feedback power signal to the power detecting signal feeder apparatus; the power detecting signal feeder apparatus is further configured to mix the feedback power signal outputted by the power detecting apparatus and the filtered high frequency RF signal, and transmit a mixed signal to the power detecting signal separating apparatus; the power detecting signal separating apparatus is further configured to recover the feedback power signal from the mixed signal from the power detecting signal feeder apparatus, adjust a calibration weight, and transmit an adjusted calibration weight to the array calibration apparatus; the array calibration apparatus placed between the base band signal processing module and the array transmitter is configured to calibrate the array antenna transmission links according to the adjusted calibration weight.