The invention provides a modularized combined type deodorizing device which comprises a top cover module and an I type filler module and further comprises an aerating module, a reinforced washing module, a dehumidifying module and/or an II type filler module, wherein the I type filler module comprises a fixed flange, a water supplying pipe, a humidifying spray head, an inspection manhole, a temperature-humidity sensor, a pH sensor, a gas distribution plate and a support; the II type filler module comprises a fixed flange, a support, an inspection manhole, a temperature-humidity sensor, a pH sensor, a discharging opening and a gas distribution plate; the aerating module comprises a fixed flange, a gas inlet, an aerating pipe, an inspection manhole, a water level sensor and a water drainingopening; the dehumidifying module comprises a fixed flange, a support, a baffle plate and dehumidifying filter cotton. The device disclosed by the invention can choose different modules to be overlapped and combined according to the gas amount of malodorous gas to be treated; compared with a single technology, the device is more suitable for treating the malodorous gas and has the advantages of small wind pressure loss, low energy consumption, low operation cost, small floor space, convenience in management and maintenance and the like.