A plastic rainwater outlet with functions such as sewage interception, deodorization, and sedimentation. Its main structure includes a sewage interception bucket, a wellbore, a sedimentation bucket, and a discharge pipe. Each component is made of plastic material and is an integrated plastic product; A rainwater grate is installed above the wellbore, and a sewage interception bucket is installed at the top of the wellbore. The sewage interception bucket is suspended from the lower part of the rainwater grate by a hook. The shape and size of the top opening of the sewage interception bucket are adapted to the shape and size of the rainwater grate. The drainage holes with a diameter of 5-10mm are evenly distributed around the side plate of the sewage interception bucket, and the diameter gradually decreases from top to bottom; The bottom of the wellbore is a sedimentation hopper, and the discharge pipe is located on the side wall of the wellbore and the upper edge of the sedimentation hopper. The present invention has multiple functions such as pollution interception, deodorization, and sedimentation, which can greatly reduce environmental pollution. It has a simple structure, easy production, energy-saving and environmentally friendly materials, low cost and durability, easy production and installation, simple maintenance, and good engineering practicality.