Simple environment-friendly filter

The utility model provides a simple environment-friendly filter, which belongs to a filtering device applicable to laboratories or households, and relates to an environment-friendly filter practical for the laboratories. A funnel with a filter screen is mounted into a sealed box body, the outlet of the funnel extends out of the box body and is sealed with the box body, and an inflation inlet with a one-way valve is mounted on the box body. The utility model has simple structure, adopts pressure filtration for better filter effect, generates no harmful volatile gas or noise, and can realize the environmental protection.