The present application relates to the technical field of radars, and disclosed thereby are a phased array transmitting array, a radar and an intelligent sensing device. The phased array transmitting array comprises: an output source; N transmitting units; M beam splitters arranged in a stage-by-stage manner, connected to the output source, and used to perform stage-by-stage beam splitting on light outputted by the output source to obtain N-path detection media, each path detection medium being incident on one of the transmitting units; and P phase modulators, wherein an input end of one of the phase modulators is connected to an output end of one of the beam splitters, an output end of at least one of the phase modulators is connected to an input end of one of the beam splitters, output ends of the remaining phase modulators are connected to input ends of the transmitting units respectively, and the P phase modulators are used to perform phase modulation on the detection media outputted by the beam splitters so that the N-path detection media meet a preset interference condition. By means of the described method, the sum of phases for phase modulation required by the phase modulators in the phased array transmitting array is reduced, thereby reducing the total power required by the phase modulators.
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