A millimeter wave imaging system, comprising: an inspection channel of a Z shape; a first millimeter wave transceiving antenna array (625a,625b) and a second millimeter wave transceiving antenna array (629a,629b) respectively provided at two opposite sides of the inspection channel, wherein each of the first and the second millimeter wave transceiving antenna arrays includes a plurality of transmitting antenna units and a plurality of receiving antenna units arranged in an area array; and a millimeter wave transceiver (103, 107) configured to drive the plurality of transmitting antenna units and the plurality of receiving antenna units in the first and the second millimeter wave transceiving antenna arrays, wherein the first millimeter wave transceiving antenna array (625a,625b) includes a plurality of sub-arrays; the second millimeter wave transceiving antenna array (629a,629b) includes a plurality of sub-arrays; each of the plurality of sub-arrays in the first millimeter wave transceiving antenna array (625a,625b) or the second millimeter wave transceiving antenna array (629a,629b) includes a plurality of transmitting antenna units and a plurality of receiving antenna units arranged in an area array; and the millimeter wave transceiver (103, 107) is configured to drive each sub-array to allow only a single transmitting antenna unit in the sub-array to transmit a millimeter wave signal at a same moment, and allow all receiving antenna units in the sub-array to receive the millimeter wave signal simultaneously, wherein the millimeter wave imaging system further comprises: a third millimeter wave transceiving antenna array (623a,627a,623b,627b) including a plurality of transmitting antenna units and a plurality of receiving antenna units arranged in an area array, wherein the first, the second and the third millimeter wave transceiving antenna arrays are provided at corners of the Z shape to allow each of the first, the second and the third millimeter wave transceiving antenna arrays to irradiate different sides of a person under inspection when the person under inspection is passing through the inspection channel. an inspection channel of a Z shape; a first millimeter wave transceiving antenna array (625a,625b) and a second millimeter wave transceiving antenna array (629a,629b) respectively provided at two opposite sides of the inspection channel, wherein each of the first and the second millimeter wave transceiving antenna arrays includes a plurality of transmitting antenna units and a plurality of receiving antenna units arranged in an area array; and a millimeter wave transceiver (103, 107) configured to drive the plurality of transmitting antenna units and the plurality of receiving antenna units in the first and the second millimeter wave transceiving antenna arrays, wherein the first millimeter wave transceiving antenna array (625a,625b) includes a plurality of sub-arrays; the second millimeter wave transceiving antenna array (629a,629b) includes a plurality of sub-arrays; each of the plurality of sub-arrays in the first millimeter wave transceiving antenna array (625a,625b) or the second millimeter wave transceiving antenna array (629a,629b) includes a plurality of transmitting antenna units and a plurality of receiving antenna units arranged in an area array; and the millimeter wave transceiver (103, 107) is configured to drive each sub-array to allow only a single transmitting antenna unit in the sub-array to transmit a millimeter wave signal at a same moment, and allow all receiving antenna units in the sub-array to receive the millimeter wave signal simultaneously, wherein the millimeter wave imaging system further comprises: a third millimeter wave transceiving antenna array (623a,627a,623b,627b) including a plurality of transmitting antenna units and a plurality of receiving antenna units arranged in an area array, wherein the first, the second and the third millimeter wave transceiving antenna arrays are provided at corners of the Z shape to allow each of the first, the second and the third millimeter wave transceiving antenna arrays to irradiate different sides of a person under inspection when the person under inspection is passing through the inspection channel. a third millimeter wave transceiving antenna array (623a,627a,623b,627b) including a plurality of transmitting antenna units and a plurality of receiving antenna units arranged in an area array, wherein the first, the second and the third millimeter wave transceiving antenna arrays are provided at corners of the Z shape to allow each of the first, the second and the third millimeter wave transceiving antenna arrays to irradiate different sides of a person under inspection when the person under inspection is passing through the inspection channel.