The joint operation with Europol also led to the discovery of 400,000 archives, including videos and photographs, showing minors of all ages being sexually abused, Xinhua news agency reported.
The Civil Guard said some of the scenes contained a "high-level" of sexual violence against the victims.
The arrests in Spain were carried out across the country and resulted in the seizure of 65 hard drives, 36 USB Flash Drives, six laptops, a router, 17 memory cards, 69 DVDs, a camera and three tablets.
The operation was set up on the basis of information received by the Swiss police who identified people involved in file-sharing in several countries, including Spain.
This is the second major operation against child pornography announced in Spain this month after seven persons were arrested for similar offences, including plans to offer holidays to paedophiles in North Africa.
