The invention discloses a device for processing dimethylamine exhaust gas and wastewater. A fan is respectively connected with a plurality of shower nozzles on the bottoms of a plurality of blowing oxidation cans; the bottom of each blowing oxidation can is externally connected with a water pump; the water pump is connected with an atomizing shower nozzle arranged in a spray tower on the upper part; the lower part of the blowing oxidation can is a dimethylamine solution cavity; the dimethylamine solution is discharged from the outlet on the top of the blowing oxidation can after being blown off by air; after the dimethylamine solution is cooled by a condenser and separated by a moisture separator, mixed gas enters a low-temperature plasma purifier to carry out purification and deodorization; and the purified air is discharged from a chimney via an induced draft fan. The device has the advantages that removal effect is above 90%, and the content of the discharged dimethylamine exhaust gas is low, thereby saving energy, reducing emission, and causing low energy consumption.