A commodity sensing system and a commodity sensing method are provided based on weight monitoring. The commodity sensing system includes: a goods database generation unit that generates a goods database; at least one shelf, wherein each shelf includes at least one rack, and at least one item of goods is placed on each rack;a weight acquisition unit that collects a real-time weight sensing value of each rack in real time; a pick or place status judgment unit that determines whether a weight sensing value of each rack changes or not, wherein if the weight sensing value of a rack becomes smaller, it determines that goods have been taken away from the rack; and if the weight sensing value of the rack becomes larger, it determines that articles have been placed on the rack; and a goods database updating unit that stores the real-time weight sensing value in the goods database, so as to update the weight sensing value of each rack in the goods database.
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