Automatic oil filling machine

The utility model discloses an automatic oil filling machine which comprises a frame body, an oil outlet pipe arranged on the frame body and vertically sliding relative to the frame body, and an oil collecting device arranged below the oil outlet pipe and used for collecting residual oil at the pipe opening of the oil outlet pipe. The oil collecting device comprises an oil receiving vessel under the oil outlet pipe; an extension pipe is arranged in the oil receiving vessel, penetrates through the bottom wall of the oil receiving vessel and is connected with the oil receiving vessel in a sliding manner; a connecting ring is fixedly connected to an upper port of the extension pipe, a stop block is fixedly connected to the lower end face of the extension pipe, an oil outlet is formed in the circumferential face of the extension pipe, and a telescopic spring is arranged on the circumferential face of the extension pipe and abuts against the position between the connecting ring and the bottom wall of the oil recei