Automatic shifting air purifier and working method thereof

The invention discloses an automatic shifting air purifier, which comprises a shell, air inlets, a clean air outlet, a filter screen, a fan and a control circuit, wherein the two side faces of the front part of the shell are provided with the air inlet respectively; the upper side face of the tail part of the shell is provided with the clean air outlet; the filter screen is arranged in the shell;the fan is arranged between the filter screen and the clean air outlet; the outer side of the shell is provided with a gas sensor, a fine particle sensor and a shift indicating lamp; the inner side of the shell is provided with the control circuit; the signal output ends of the gas sensor and the fine particle sensor are electrically connected with the control circuit; and the control end of the control circuit is electrically connected with the fan and the shift indicating lamp respectively. The quality of indoor air is sensed by using the gas sensor and the fine particle sensor, and the flow of purified air is adjusted by automatically adjusting the rotating speed of the fan according to the air quality with the control circuit, so that the air purifying efficiency is increased effectively.