An electromagnetic shielding lock box comprises an openable and closable box body. The box body is defined an accommodating groove, made by electromagnetic shielding materials, and has a lock unit and a hooking member. The box body is closed for receiving at least one key while the lock unit is in a locked status and for shielding the transmission of at least one electromagnetic wave signal due to the electromagnetic shielding materials. The lock unit is further limited the hooking member to be locked to the box body. The box body is opened for taking the at least one key out while the lock unit is in an unlocked status to unlock the hooking member from the box body.