Abstract: This paper designs and simulates the circuit of coin saving box based on Multisim. The design uses optical coupler as the coin detection module,uses the trigger unit and logic gate circuit as the pulse generating module,and uses the counting chip as the counting module. The design has the function of coin detection,display of coin counting and the total amount of calculation,the circuit also has the function of reset. It designs various function in digital circuit by Multisim,and students can realize the function of circuit and the simulation visualization by simple operation,and it also can observe the effect when parameter varying.