An automatic inspection and control method of car body welding spots, the method being characterised by the following steps: employing an automatic inspection system of welding spots in a car body, the system comprising a controller, a robotic arm, a probe device comprising a probe, and a visual system comprising a camera and an image collecting and processing device, wherein the robotic arm holds the camera and the probe device, the probe device aligns with a welding spot in the car body, a first included angle is formed between the camera and the probe device, several lighting sources are distributed around the camera, forming a second included angle with the camera, the camera is connected with the image collecting and processing device to determine the position of the welding spot in the car body, the controller is connected with the image collecting and processing device by a network, and is configured to rectify the position of the probe device on the robotic arm according to the position of the welding spot in the car body, and further characterised by the following steps: S1: Align the probe on the robotic arm with a welding spot in the car body; S2: Photograph the position of the welding spot with the camera to obtain images with a certain tilt; S3: Correct the tilted images with the image collecting and processing device to obtain images as if they were photographed at orthographic projection shooting angle, so as to determine actual position of the welding spot, and calculate the offset between the measured position and a preset point; S4: Correct position of the probe on the robotic arm according to the offset; S5: Control the probe to inspect the quality of the welding spot in the car body, wherein, in S2, several lighting sources, which form the second included angle with the camera and are controlled by software, lighten the car body successively in different directions and obtain images with different directions of shadow due to no obvious difference of gray level between the welding spot and the background, and the position with concave-convex change is determined as the central position of the welding spot via calculation after superposition of images with different directions of shadow. employing an automatic inspection system of welding spots in a car body, the system comprising a controller, a robotic arm, a probe device comprising a probe, and a visual system comprising a camera and an image collecting and processing device, wherein the robotic arm holds the camera and the probe device, the probe device aligns with a welding spot in the car body, a first included angle is formed between the camera and the probe device, several lighting sources are distributed around the camera, forming a second included angle with the camera, the camera is connected with the image collecting and processing device to determine the position of the welding spot in the car body, the controller is connected with the image collecting and processing device by a network, and is configured to rectify the position of the probe device on the robotic arm according to the position of the welding spot in the car body, and further characterised by the following steps: S1: Align the probe on the robotic arm with a welding spot in the car body; S2: Photograph the position of the welding spot with the camera to obtain images with a certain tilt; S3: Correct the tilted images with the image collecting and processing device to obtain images as if they were photographed at orthographic projection shooting angle, so as to determine actual position of the welding spot, and calculate the offset between the measured position and a preset point; S4: Correct position of the probe on the robotic arm according to the offset; S5: Control the probe to inspect the quality of the welding spot in the car body, wherein, in S2, several lighting sources, which form the second included angle with the camera and are controlled by software, lighten the car body successively in different directions and obtain images with different directions of shadow due to no obvious difference of gray level between the welding spot and the background, and the position with concave-convex change is determined as the central position of the welding spot via calculation after superposition of images with different directions of shadow. S1: Align the probe on the robotic arm with a welding spot in the car body; S2: Photograph the position of the welding spot with the camera to obtain images with a certain tilt; S3: Correct the tilted images with the image collecting and processing device to obtain images as if they were photographed at orthographic projection shooting angle, so as to determine actual position of the welding spot, and calculate the offset between the measured position and a preset point; S4: Correct position of the probe on the robotic arm according to the offset; S5: Control the probe to inspect the quality of the welding spot in the car body, wherein, in S2, several lighting sources, which form the second included angle with the camera and are controlled by software, lighten the car body successively in different directions and obtain images with different directions of shadow due to no obvious difference of gray level between the welding spot and the background, and the position with concave-convex change is determined as the central position of the welding spot via calculation after superposition of images with different directions of shadow.