The invention discloses an automatic water level control circuit of a rural water tank. The automatic water level control circuit comprises a data signal input portion, a button, audible and visual indication alarm and calender clock display portion, a single chip microcomputer basic circuit portion and a motor control portion. The automatic water level control circuit of the rural water tank has the advantages that the automatic water level control circuit is simple and practical in structure, simple in operation, easy to popularize and quite suitable for common rural families, can work stably and reliably, has complete functions and is environmental friendly, and energy can be saved.