The invention discloses an agricultural product clamping device and an agricultural product packaging machine. The agricultural product clamping device is used for being arranged under an agriculturalproduct packaging bag installing cylinder and used for clamping and positioning agricultural products in packaging bags; the agricultural product clamping device comprises a first positioning clamp,a second positioning clamp which is arranged to be opposite to the first positioning clamp in a spaced mode so as to be used for clamping the packaging bags and the agricultural products from the twosides of the agricultural products in the packaging bags with the first positioning clamp and a driving assembly used for driving the first positioning clamp and the second positioning clamp to be faraway from each other or be close to each other; and the first positioning clamp and the second positioning clamp are arranged in an included-angle inclination mode. According to the agricultural product clamping device, the sealing position of each packaging bag can be fixed by clamping the packaging bag containing the agricultural product before the packaging bag is sealed, and therefore the sizes of the packaging bags are consistent.