The invention discloses a methanol-tolerance foaming drainage agent. The methanol-tolerance foaming drainage agent comprises the following active ingredients in parts by weight: 30-50 parts of saponin extract, 10-30 parts of polyethylene glycol, 2-8 parts of triethanolamine, 10-30 parts of alkyl alcohol polyoxyethylene ether, and 10-20 parts of water; the invention further discloses a preparation technology. The methanol-tolerance foaming drainage agent and preparation technology thereof have the beneficial effects that compared with the traditional foaming drainage agent, the methanol-tolerance foaming drainage agent has the characteristics of being simple in components, non-toxic and environment-friendly, strong in self-foaming capability, good in foam stability, and strong in liquid-carrying capability and methanol-tolerance capability; the method has the characteristics of being easy to operate, low in equipment and environment requirements, capable of easily realizing the industrial production, and high in the cost performance of the product.