The present invention discloses a live pig quantity checking apparatus and method. The checking method includes: obtaining first electronic ear tag numbers of electronic ear tags within a period of time interval threshold range； determining whether live pigs in a monitored piggery all have a food intake activity, and if yes, determining a quantity of the live pigs according to the first electronic ear tag numbers； and if no, determining live pigs not having the food intake activity according to the first electronic ear tag numbers. The live pig quantity checking apparatus and method of the present invention improves the live pig quantity checking efficiency.
