Garden sewage treatment device

The utility model discloses a garden sewage treatment device which comprises a precipitation treatment box, one side of the top end in the precipitation treatment box is fixedly connected with a crushing box, the interior of the crushing box is rotatably matched with a crushing cutter, and the bottom end in the precipitation treatment box is provided with a precipitation tank; a water inlet pipe is fixedly connected to one side of the top end of the precipitation treatment box, and a spiral roller is rotationally matched with the interior of the water inlet pipe; a circulating pipe is fixedly connected to the upper portion of one side of the precipitation treatment box, a purifying box is fixedly connected to one end of the circulating pipe, and a plurality of groove blocks are fixedly connected to the interior of the purifying box. The water pump, the purification box and the drainage pipe are arranged, the water pump drives sewage to be pumped out, the sewage flows into the purification box through the circ