The invention discloses an underground water pipeline with a stair restriction block. The underground water pipeline comprises a pipeline body, wherein the pipeline body is paved under the ground, the two ends of the pipeline body communicate, the stair restriction block is arranged in the pipeline body, the upper end of the stair restriction block is fixed to the pipeline wall of the upper end of the pipeline body, the front end of the stair restriction block is provided with multiple layers of oncoming restriction steps, the oncoming restriction steps extend backwards and inwards, and the front-end step corners of the oncoming restriction steps are arc-shaped chamfers. Through the mode, restriction can be carried out on the underground water pipeline, and water flow is prevented from being too rapid, applying certain pressure on the pipeline body and crushing the pipeline body; and the stair restriction block in the pipeline body can restrict water flow and reduce the burden of the pipeline body when water flow is too large, so that the service life of the pipeline body is prolonged.