The invention relates to a triethylamine wastewater treatment method. The method comprises steps as follows: a, triethylamine wastewater is continuously pumped into a wastewater treatment trough; b, a treating agent containing a ferrous sulfate solution and a hydrogen peroxide residual liquid is introduced; c, the PH value of the wastewater is adjusted to be controlled in the range of 3.5-4.0; d, a wastewater treatment reaction is performed at the volume ratio of the treating agent to the triethylamine wastewater being 0.29:1; e, the reaction time is controlled to be 6 h, the oxidation digestion process is a lasting process, the triethylamine wastewater continuously enters the wastewater treatment trough within 6 h and the treating agent also continuously enters the wastewater treatment trough until the COD (chemical oxygen demand) in the wastewater is smaller than 7,140. The triethylamine wastewater treatment method has the advantages as follows: the triethylamine wastewater is treated with the hydrogen peroxide residual liquid and ferrous sulfate, so that the hydrogen peroxide residual liquid is turned into valuables, the treatment cost is low, and an unexpected result is obtained; the digestion rate of COD is up to 80%, and the follow-up treatment difficulty is reduced; the treated water is clear, and little sludge is generated.