Heat exchanger with automatic cleaning function

The invention discloses a heat exchanger with an automatic cleaning function, which structurally comprises a pipe body, an oil outlet pipe, a shaft rod, a circulating system, cover bodies and a mounting buckle, wherein the cover bodies are mounted at two horizontal ends of the pipe body respectively, the shaft rod penetrates through the middle of one cover body, the circulating system is arrangedin the inner part opposite to the cover body above the shaft rod, the oil outlet pipe is arranged at the bottom of the pipe, the oil outlet pipe is communicated with the pipe body, and the mounting buckle is mounted at the top end of the pipe body opposite to the oil outlet pipe. According to the invention, a hot air inlet pipe and a slope block are matched with each other, hot air enters a flowing cavity from the hot air inlet pipe and then contacts with fins in the pipe body, the grease melts due to the hot air when the hot air passes through, touches the inner wall of the slope block, gradually slides down along th