A coin deposit and summation memory device having a coin denomination identification mechanism and a coin denomination summation mechanism. The device, based on diameter features of different coin denominations, determines different mechanical action characteristic circulations, with a different mechanical feature circulation path driving a characteristic mechanical signal/mechanical action corresponding to the coin denomination; the characteristic mechanical signal corresponding to the coin denomination drives a mechanical counter wheel that, according to the characteristic mechanical signal, does the data summation once that corresponds to the coin denomination. The present invention, able to achieve identification and summation of the 20-ary (0.5 basic unit) or 40-ary (0.25 basic unit) or 50-ary (0.20 basic unit) coin denomination, solves the problem of using a coin slot to circularly identify different denominations of coins and sum up the denominations of the identified coins, having a reasonable structure, convenience for use and other advantages.