The utility model provides a pantograph circuit, comprising a pantograph, a data processor. Wherein, the data output end of the data processor is connected with the data input end of the pantograph. The utility model is characterized in that the pantograph circuit also comprises a data processor controller which is connected with the controlling end of the data processor. The pantograph only needs the existing CPU to switch the input of the two groups of data signals, and thus, the purpose of inputting two groups of 24 bit data signals can be achieved and the insufficiency of data port conflict can be effectively resolved. Because only the existing cpu is used, the utility model has the advantages of simple structure, easy implement, and low cost.