The invention discloses straw hat glue and a preparation method thereof. The straw hat glue comprises the following components in parts by weight: 5-10 parts of raw glue, 1-3 parts of a stiffening agent, 18-20 parts of ethanol for the straw hat glue and 0.1-0.3 part of ethylene glycol monobutyl ether; the raw glue comprises polyvinyl butyral and ethanol for the raw glue; the mixing weight ratio ofthe polyvinyl butyral to the ethanol for the raw glue is 1 to 8-10; the stiffening agent comprises modified polyvinyl butyral and ethanol for the stiffening agent; the mixing weight ratio of the polyvinyl butyral and ethanol for the stiffening agent is 1 to 8-10. The straw hat glue has the beneficial effects as follows: the straw hat glue can shape a straw hat to improve the hardness and the aesthetic degree of the straw hat, and has the characteristics of no toxicity and environment friendliness, so that the body damage to gluing personnel is reduced.