The invention discloses an air purifier based on the internet of things. The air purifier comprises a gateway used for connecting an external network, a control unit, a power supply unit and an air purifier body; the gateway is connected with the control unit, and the gateway is connected with the power supply unit through a wireless network, wherein a network node and a wireless transmitting module which are connected through a first circuit are arranged in the power supply unit; a wireless receiving module and a purification control module which are connected with each other are arranged in the air purifier body; when the gateway receives a control signal sent by the external network, the wireless transmitting module is triggered to send a control instruction to the wireless receiving module, and the purification control module controls the air purifier body to enable or disable the air purification function according to the control instruction. The purification function can be enabled or disabled according to a network indication.