A West Australian father has been accused of facilitating the abuse of his 13-year-old daughter by himself and seven other men.

The eight men aged 35-47, including the father, have been charged with 503 offences against the girl, who was aged between 11-13 at the time of the alleged crimes.

Charges included sexual penetration of a child under 13, indecently dealing with a child under 13, distribution of child exploitation material and sexual servitude of a child.

Police have also seized a "large quantity" of computer storage devices, a spokesman said.

The spokesman alleged just one of the eight men was responsible for more than 200,000 videos and four million images seized, though not all involved the alleged victim.

Police said at this stage they are not working to identify any other alleged victims.

It is alleged the other seven men all knew the father, who is accused of "facilitating" the abuse.

The father is accused of organising for the seven men to meet the victim at various locations.

The alleged perpetrators are from various suburbs including Attdale, Wanneroo, Wembley, Coodanup, South Bunbury, Banksia Grove and Bedfordale.

The spokesman said all men had appeared in court, with one pleading guilty, after the arrests were made last week.

Investigators will allege the men all knew the father, though the spokesman said they were not part of a common group such as a sporting team.

Police were first alerted to the alleged abuse after receiving a tip from a member of the public in April.

The investigation is ongoing.