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Critics have blasted the figures and say it highlights a major crisis.
The Ministry of Justice said the average extra sentence for attacking prison workers was 20 in 2010, compared with 16 in 2015.
Conservative MP Philip Davies said: “It’s no wonder discipline in prisons is in such a crisis.
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It’s no wonder discipline in prisons is in such a crisis
MP Phillip Davies
“Surely a prisoner who assaults a prison officer should also have to serve the full sentence given to them by the courts for their original offence as well as these extra days. Prison officers deserve more support.”
Lib Dem leader Tim Farron added: “The only thing going down in prisons is extra time people get for committing violent acts in it. It’s bonkers.”
The statistics revealed 7,984 additional days were given to 439 prisoners for assaults on staff in 2015.
Birmingham Prison Riot Fri, December 16, 2016
Prisoners 'smash lights and threaten officers after getting hold of keys' as riot breaks out at HMP Birmingham
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The Uk's prisons are at breaking point
This compares with 5,163 days for 258 prisoners in 2010.
The huge issues facing the UK prison system were revealed in the BBC’s Panorama programme this week, which followed an investigation into HMP Northumberland.
The programme shows prisoners taking drugs openly and a prison guard even having to be taken to hospital because of the effects of drugs in the atmosphere.
BBC reporter, Joe Fenton, said: “I saw prisoners stumbling around drunk, others who were high on drugs and some struggling to cope with addiction.
"Prison officers repeatedly told me they had lost control of the prison. I saw officers worried about their safety and losing confidence."
The Ministry of Justice has said it is to boost frontline officers by 2,500 as part of a £100m investment.
Between October 2015 and September 2016 there were 6,430 – making it very likely that the full total for 2016 will be more than the record high set the year before.
The Prison Officers Association has warned that prison staff shortages leave jails facing “bloodbaths”.
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