The invention provides a cloud intelligent air purifier which comprises a shell with an air inlet and an air outlet, a filter device arranged in the shell, and a suction device, wherein the filter device comprises a primary filter, an electrostatic dust collector and a negative ion generator which are arranged in sequence; the primary filter is arranged at the air inlet of the shell; an air quality sensor capable of detecting the contents of ozone, PM2.5, formaldehyde and negative oxygen ions is arranged at an air inlet of the primary filter; the air quality sensor and the filter device are connected with a control device; an ozone parameter, a PM2.5 parameter, a formaldehyde parameter and a negative oxygen ion parameter are preset in the air quality sensor; and when detecting that an air index at the air inlet is greater than the above-mentioned parameter values, the control device controls the electrostatic dust collector to be switched off so as to realize automatic circulating control. The air purifier provided by the invention avoids harm to a human body during air purification.