A lidar system (10, 30), comprising: a light source (111, 311), an optical transmission module (112, 312), a scanning module (12, 22, 32), and a detection module (13, 33), wherein the light source (111, 311), the optical transmission module (112, 312), and the scanning module (12, 22, 32) are sequentially arranged along a first optical path; the scanning module (12, 22, 32), the optical transmission module (112, 312), and the detection module (13, 33) are sequentially arranged along a second optical path; wherein in the first optical path, the light source (111, 311) is configured to transmit a laser beam, the optical transmission module (112, 312) is configured to transmit the laser beam, which is transmitted by the light source (111, 311), to the scanning module (12, 22, 32), and the scanning module (12, 22, 32) is configured to reflect the laser beam, which is transmitted by the optical transmission module (112, 312), to a three-dimensional space, and is configured to change a direction of the laser beam thereby reflected to the three-dimensional space, so as to scan the three-dimensional space; and wherein in the second optical path, the scanning module (12, 22, 32) is configured to reflect an echo signal of the laser beam to the optical transmission module (112, 312), and the optical transmission module (112, 312) is configured to reflect the echo signal of the laser beam, which is reflected by the scanning module (12, 22, 32), to the detection module (13, 33), the detection module (13, 33) is configured to receive and process the echo signal of the laser beam that is reflected by the optical transmission module (112, 312), to obtain information on an obstacle in the three-dimensional space, and the echo signal of the laser beam is formed by the obstacle in three-dimensional space by reflecting the laser beam reflected by the scanning module (12, 22, 32), characterized in that the optical transmission module (112, 312) comprises: a support body (1121, 316), wherein an optical channel (316a, 316b) is set in the support body (1121, 316); and a plurality of transmission submodules, wherein the plurality of transmission submodules is disposed on the support body (1121, 316) and is sequentially arranged along the optical channel (316a, 316b), and is configured to transmit a beam along a preset optical path defined by the optical channel (316a, 316b). a light source (111, 311), an optical transmission module (112, 312), a scanning module (12, 22, 32), and a detection module (13, 33), wherein the light source (111, 311), the optical transmission module (112, 312), and the scanning module (12, 22, 32) are sequentially arranged along a first optical path; the scanning module (12, 22, 32), the optical transmission module (112, 312), and the detection module (13, 33) are sequentially arranged along a second optical path; wherein in the first optical path, the light source (111, 311) is configured to transmit a laser beam, the optical transmission module (112, 312) is configured to transmit the laser beam, which is transmitted by the light source (111, 311), to the scanning module (12, 22, 32), and the scanning module (12, 22, 32) is configured to reflect the laser beam, which is transmitted by the optical transmission module (112, 312), to a three-dimensional space, and is configured to change a direction of the laser beam thereby reflected to the three-dimensional space, so as to scan the three-dimensional space; and wherein in the second optical path, the scanning module (12, 22, 32) is configured to reflect an echo signal of the laser beam to the optical transmission module (112, 312), and the optical transmission module (112, 312) is configured to reflect the echo signal of the laser beam, which is reflected by the scanning module (12, 22, 32), to the detection module (13, 33), the detection module (13, 33) is configured to receive and process the echo signal of the laser beam that is reflected by the optical transmission module (112, 312), to obtain information on an obstacle in the three-dimensional space, and the echo signal of the laser beam is formed by the obstacle in three-dimensional space by reflecting the laser beam reflected by the scanning module (12, 22, 32), characterized in that the optical transmission module (112, 312) comprises: a support body (1121, 316), wherein an optical channel (316a, 316b) is set in the support body (1121, 316); and a plurality of transmission submodules, wherein the plurality of transmission submodules is disposed on the support body (1121, 316) and is sequentially arranged along the optical channel (316a, 316b), and is configured to transmit a beam along a preset optical path defined by the optical channel (316a, 316b). a support body (1121, 316), wherein an optical channel (316a, 316b) is set in the support body (1121, 316); and a plurality of transmission submodules, wherein the plurality of transmission submodules is disposed on the support body (1121, 316) and is sequentially arranged along the optical channel (316a, 316b), and is configured to transmit a beam along a preset optical path defined by the optical channel (316a, 316b).