The invention discloses a maintenance-free rural domestic sewage treatment device, and relates to the field of domestic sewage treatment. The maintenance-free rural domestic sewage treatment device comprises a sand settling pond, a pump I, a reactor I, a pump II, a reactor II, a pump III, a drain pipe, an electric control cabinet and a remote monitoring system. The electric control cabinet is connected with the pump I, the pump II and the pump III, the sand settling pond, the pump I, the reactor I, the pump II, the reactor II, the reactor III and the drain pipe are sequentially connected withone another, the reactors are used for accommodating biological carriers, microorganisms can be attached to the biological carriers, and the remote monitoring system is used for monitoring water levelprotection heights of the reactors. The maintenance-free rural domestic sewage treatment device has the advantages that water can be uniformly distributed without dead spaces, can be quickly drainedand re-aerated and can be sufficiently uniformly re-aerated, biological film cultivation procedures can be omitted, the maintenance-free rural domestic sewage treatment device can run in a programmedmanner, and full-automatic unattended operation further can be implemented; the water level protection heights of the reactors can be remotely monitored, so that the biological carriers can be timelyreplaced or cleaned, and the maintenance-free rural domestic sewage treatment device is high in organic load impact resistance.