The invention discloses an agricultural product traceability information storage method based on a block chain, and the method comprises the steps: generating block data comprising the head part of ablock, a block body and other information, and achieving the streaked, normalized and persistent storage of the agricultural product traceability information; information such as a block number and forward Hash is added to the head part of the block, and information such as ontology Hash reality is added to the block body, so that all the blocks form a one-way linked list together. The invention discloses a traditional agricultural product tracing information storage technology. the storage of the tracing data can be realized; query and block-based data integrity verification can be realized;the prevention control, check control and recovery control capabilities of enterprises, consumers and administrative competent departments on agricultural product traceability information are improved, the transparency of the agricultural product traceability information is promoted, and the safety awareness and participation degree of all the society bounds on the quality of agricultural productsare enhanced.