The invention provides a waste gas purification device convenient for heat recovery. The waste gas purification device includes a flame retardant chamber, a separation purification chamber and a flameretardant drying chamber connected successively and communicating with each other; the flame retardant chamber and/or the flame retardant drying chamber are internally provided with granular materials; the separation purification chamber is internally provided with a barrier plate, and the barrier plate divides the separation purification room into a gas channel and an accommodating cavity whichcommunicate with each other via a separation cylinder; the separation cylinder is internally provided with an rotary induced separation column with meshes. Waste gas is sent into the flame retardant chamber, the waste gas is retardant to flame by irregular movement of the high-temperature resistant granular materials in the flame retardant chamber, and the waste gas enters the gas channel and enters a conical cavity of the separation cylinder from a through hole; the induced separation column is rotated under driving of a motor, gas after cracking enters the accommodating cavity via the bottomof the induced separation column and then enters the flame retardant drying chamber, and the gas is further purified and dried. The waste gas purification device has less heat loss of the gas and isconvenient for further heat recovery.