Air purifier

An air purifier comprises a shell provided with an air inlet and an air outlet. The shell is internally provided with a filtering assembly and a fan. The air purifier is characterized in that the shell is formed by detachably combining an upper shell and a base, the air inlet is located in the top of the upper shell, and the air outlet is located in the side portion of the upper shell; a roller assembly is rotationally arranged in the base and partly immersed in liquid used for removing formaldehyde, and the roller assembly is arranged below the fan and comprises at least one roller set and a drive motor; and each roller set is formed by connecting rollers through a rotating shaft in series, a formaldehyde removing catalyst is adsorbed to the surfaces of the rollers, each roller set is connected with the drive motor through a transmission mechanism, and the roller assembly is provided with a handle assembly used for connecting the roller sets together and facilitating lifting. The shell is simple in structure