The invention discloses an air purifier of a cleaning room.The air purifier comprises a primary filter mechanism, a draught fan and a secondary filter mechanism, wherein the primary filter mechanism and the secondary filter mechanism are fixed by buckling clamping hooks in a clamping mode through elastic extension of an elastic piece; the purifier is provided with a static dust collecting filter and a deodorization filter, and air passes through a purifier portion in an S-shaped curve route.According to the device, the air purification efficiency is high, connection and disassembly between the primary filter mechanism and the secondary filter mechanism are convenient, and cleaning and maintaining are convenient; air sequentially passes through the static dust collecting filter and the deodorization filter in the secondary filter mechanism in an S-shaped curve route, therefore, the retention time of the air in the purifier can be prolonged, and the purification efficiency is improved.