Disclosed are a carbon emission accounting method, a device and a system for recycling of waste battery. The carbon emission accounting apparatus includes a data collection unit and an average-value calculation unit. The carbon emission accounting apparatus includes a collection transmission module and a calculation processing module. The method includes: collecting carbon emission data groups for multiple times within a period; and according to the carbon emission data groups and a preset carbon emission accounting formula group, calculating an average carbon emission amount corresponding to data collected for multiple times within the period.