Gravel filtering device based on geothermal well

The utility model provides a gravel filtering device based on a geothermal well, relates to the technical field of gravel filtering, and aims to solve the problems that the existing filtered gravel is easy to remain at the top of a filter screen and the gravel at the top of the filter screen is inconvenient to clean by a worker, and the gravel filtering device comprises the geothermal well, a filtering assembly and a top cover, the filtering assembly is mounted in the geothermal well; the top cover is mounted at the top of the geothermal well; a supporting ring is fixedly mounted in the geothermal well; three water inlet grooves are formed in the top cover in a penetrating manner, and a water inlet pipe is fixedly mounted at the top of the top cover; the flow guide cover is mounted at the top of the supporting ring; the filter screen is mounted in the flow guide cover; due to the arrangement of the flow guide cover, filtered gravel is guided, it is guaranteed that the filtered gravel is located in the filter