A preparation method for hawthorn fruit juice comprises the following steps: selecting fresh large hawthorn fruits as a raw material, then mashing, blending with water, carrying out astringency removal, decocting, extracting, clarifying fruit juice and blending so as to obtain the finished product namely fruit juice. Through implementation of the preparation method, the hawthorn fruits are mashed firstly to obtain mashed fruit pulp, so that effective ingredients can be effectively extracted from the fine fruit pulp and also have a good effect for the astringency removal link. Through pre-stewing the fruit pulp for astringency removal, not only is bitterness in the hawthorn fruits effectively removed, but also original nutrients and functional ingredients of the hawthorn fruits are well retained; in addition, a physical method is adopted completely in the whole astringency removal process and any chemical additive is not added, so that the original ecological property of the hawthorn fruit juice is remained. Meanwhile, the hawthorn fruits are mashed firstly, then the mashed hawthorn fruits are blended with water for decoction and finally, the fruit juice is extracted, so that the effective ingredients of the hawthorn fruits can be extracted out completely, the prepared fruit juice has not only the original function of the hawthorn fruits, but also an excellent healthcare effect, and is good in palatability and high in commercial value.