The YLS-12A/B type intelligent blood sampling weighing instrument (hereinafter referred to as the weighing instrument) adopts modern sensor technology and is equipped with trays, swing mechanism, single-chip control circuit and other components. Its structure is reasonable and durable, and meets the requirements of "fast, accurate, continuous "Automatic" weighing requirements, while effectively eliminating human error, avoiding physical damage to the blood, ensuring the survival rate of the effective components of the blood during the liquid collection process, and making it more in line with the legal measurement management and blood collection process control Application requirements are applicable to blood collection institutions everywhere.