Both forces are taking part in a national campaign following a spate of stabbings across the country.
A week long operation’s getting under way this morning - it was planned before the most recent increase in fatal stabbings.
It will see an increase in stop and searches and weapon's sweeps.
Police are asking the public to open their eyes to knife crime especially because criminals are hiding bladed weapons in public spaces.
Inspector Andy Creer from Merseyside Police said: "A lot of work goes on behind the scenes to address the issue of knife crime and what can be done about it but one of the most important tools we have is education. Most people probably don’t realise that carrying a knife can make a young person up to 60% more likely to become a victim of knife crime themselves.
"Nobody wants to be a statistic and I want to appeal directly to parents and guardians - talk to your children about knife crime, educate them of the dangers and help us to make it socially unacceptable for ANYONE to carry a knife when they go out.
"Anyone who chooses to pick up a knife could be throwing away their lives and destroying the lives of others. Merseyside has seen at first hand the tragedy of knife crime and the effect it can have on the victims, the knife crime offenders and the families left behind. Nobody wants that knock on the door from the police so please, have that conversation with your loved ones.
"I want to reassure our communities that we will continue our work day in and day out and we are committed to getting rid of the problem of knife crime by working closely with our partners to help prevent and disrupt criminal activity.
"We will also continue to act on information reported to us through local policing teams or community leaders.
"But this is not a problem that Merseyside Police can tackle alone and we need everyone to be involved."