The invention relates to the field of sewage treatment, and discloses a method for treating ammonium-salt-containing wastewater; the method is as follows: introducing the wastewater into a first MVR evaporation device for first evaporation to obtain a first ammonia-containing vapor and a first concentrated liquid, respectively introducing the first concentrated liquid into a second MVR evaporationdevice for second evaporation to obtain a second ammonia-containing vapor and a second concentrated liquid; before the wastewater is introduced into the first MVR evaporation device, the pH of the wastewater is adjusted to be greater than 9; before the wastewater is introduced into the first MVR evaporation device, the first ammonia-containing vapor is exchanged with the wastewater to obtain first ammonia water, and the first evaporation causes the solid content in the first concentrated liquid is 50% by mass or less. The method is a low-cost and environment-friendly ammonium-containing high-salt wastewater treatment method, the method can recover ammonium and salts in the wastewater, maximizes the reuse of resources in the wastewater, and can achieve near-zero emission.