The invention discloses a four-phase separator for oil, gas, water and methyl alcohol in the natural gas treatment process, which comprises a tank body, wherein, the tank body is separated into a gas-liquid separation chamber, a deposition-separation chamber, an oil chamber, a water chamber and a steam stripping methyl alcohol chamber from top to bottom through baffle plates, a steam stripping tube with a plurality of steam stripping elements is arranged in the tank body, the top end part of the steam stripping tube extends out of the tank body and is provided with a stripping gas outlet and a methyl alcohol rich solution inlet, the bottom end of the steam stripping tube is communicated with the steam stripping methyl alcohol chamber, a stripping gas inlet is arranged at the position corresponding to the steam stripping methyl alcohol chamber on the tank body, and a fluid-conveying pipe is communicated between the water chamber and the methyl alcohol rich solution inlet. The inventionhas the advantages that a structure for separating the methyl alcohol is added on the basis of the existing oil, gas and water separator to ensure that the four-phase separation for the oil, the gas,the water and the methyl alcohol can be completed in an equipment, thereby having great influential effect on reducing the investment, saving the occupied land, reducing the operation and the work capacity of the maintenance and enhancing the construction level of the oil field.