Abstract: This application provides a coordinate transformation circuit and method, applied in the field of LiDAR technology. The circuit includes at least one coordinate transformation module, where the coordinate transformation module includes a control module and a data processing module. The control module is connected to an optical detection module, and the data processing module is connected to the control module. The optical detection module is used to obtain the scanning coordinates and detection distance of the detection point during operation. The control module is used to receive an operation trigger signal and the scanning coordinates and detection distance of the detection point sent by the optical detection module. The control module sends the scanning coordinates and detection distance to the data processing module and controls the data processing module to determine the radar coordinates of the detection point.