Fresh air ventilator

The utility model provides a fresh air ventilator, relates to the technical field of air purification, and aims to solve the technical problems that a fresh air ventilator in the prior art is single in fixing angle, and the placement direction of the fresh air ventilator cannot be adjusted according to actual working condition requirements. The device comprises a machine body and a filter screen,a first air chamber and a second air chamber are arranged in the machine body; the first air chamber and the second air chamber are both communicated with the outside and the inside, when air in one of the first air chamber and the second air chamber flows from the inside to the outside, air in the other air chamber flows from the outside to the inside, and the filter screen is detachably arrangedin the other air chamber so as to filter air entering the inside through the other air chamber. The air purifier is used for purifying indoor air and is simple in structure, and the mounting angle can be adjusted as required.