A target detection method, an electronic device, a roadside device and a cloud control platform are provided and relate to the technical field of intelligent transportation. The target detection method includes acquiring a detection image of a target to be detected, wherein the detection image is an image taken by a detection monocular camera for the target to be detected; extracting position information of the target to be detected by inputting the detection image into a target detection model, wherein the target detection model extracts the position information of the target to be detected from the detection image, and the position information of the target to be detected comprising pixel coordinates of a projection, on an image plane of the detection monocular camera, of a center point of an orthographic projection of the target to be detected on a ground where the target to be detected is located and determining a three-dimensional position of the target to be detected based on the position information of the target to be detected.