The invention discloses a protective device of data inside chips, comprising a monitoring circuit and a three-dimensional electrical network, wherein the monitoring circuit is connected to the protected chips; the three-dimensional electrical network is connected with the monitoring circuit and is detected by the monitoring circuit; when the monitoring circuit detects that the parameter of the three-dimensional electrical network exceeds the threshold value, the monitoring circuit deletes the data in the protected chips or sends a data deletion instruction to the protected chips. The protective device of data inside chips can effectively improve the safety of data inside chips.