Multifunctional automatic welding device for automobile container door body

The invention relates to the technical field of automobile cargo tank door body machining, and provides a multifunctional automatic welding device for an automobile cargo tank door body to solve the problem that an existing welding device for the automobile cargo tank door body cannot automatically and stably position and fix a reinforcing piece needing to be used on the automobile cargo tank door body. A protective side plate is fixedly connected to the top end face of the fixed bottom plate, a fixed top plate is fixedly connected to the top end of the protective side plate, a positioning and fixing assembly is installed on the fixed bottom plate, a container door body is arranged on the fixed bottom plate, and reinforcing rods are arranged on the container door body. A first rodless air cylinder barrel is fixedly installed on the bottom end face of the fixed top plate, and a first rodless air cylinder sliding table is connected to the first rodless air cylinder barrel. According to the device, the reinforci