The invention discloses alcohol-resistant nylon and a preparation method thereof. The alcohol-resistant nylon is prepared from nylon 1012/12I copolymer resin, multi-functional epoxy resin and a cross-linking agent. According to the prepared alcohol-resistant nylon, after nylon 1012 and nylon 12I are copolymerized, benzene rings are introduced into a molecular chain, and the alcohol resistance is further enhanced; due to addition of the cross-linking agent, micro-crosslinking of a polymer is promoted, and the alcohol resistance of the material is further improved; the alcohol-resistant nylon can be used for a long time in the environment with the temperature ranging from -40 DEG C to 100 DEG C; the explosion pressure is greatly improved; after a compound pipe with a core pipe made of the alcohol-resistant nylon 1012/12 I is soaked in methyl alcohol for 168 h, the explosion pressure is kept to be 90 MPa or above, and the explosion pressure can reach 104 MPa at most.