The invention discloses a four-phase separator for oil, gas, water and methyl alcohol in the natural gas treatment process, the four-phase separator comprises a tank body, a gas-liquid separation chamber, a deposition-separation chamber, an oil chamber, a water chamber and a steam stripping methyl alcohol chamber are separated from top to bottom in the tank body through a baffle plate, 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 is extended out from 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 on the tank body corresponding to the steam stripping methyl alcohol chamber, and a fluid-conveying pipe is communicated between the water chamber and the methyl alcohol rich solution inlet. The separator has the advantages that a structure for separating the methyl alcohol is added on the basis of the prior 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 to reduce the investment, save the occupied land, reduce the operation and the work capacity of the maintenance and enhance the construction level of the oil field.