It comes after a meeting between Premier Daniel Andrews and unions following public outrage over the quashing of a jail term for two women who assaulted a paramedic in 2016.

The reforms, set to be introduced into parliament in coming weeks, mean attacks which injure emergency service workers will be treated as "category 1" offences, the same as rape and murder.

The changes also mean courts would be forced to jail anyone convicted over such attacks, a joint statement by the premier, Police Association and Ambulance Employees Australia Victoria said on Monday.

It added an emergency worker harm reference group would be established to oversee the implementation of the reforms.

"Our police, paramedics, firefighters and other emergency workers put their lives on the line every day to help keep us safe - it is unacceptable that they should be attacked or assaulted just for doing their job," the statement said.

Last week, Amanda Warren, 33, and Caris Underwood, 22, had the jail sentences they received for assaulting paramedic Paul Judd quashed on appeal by Victoria County Court judge Barbara Cotterell.

Warren and Underwood were originally sentenced to six months and four months, respectively, but Judge Cotterell said their traumatic childhoods and young families meant the minimum six-month term should not apply.

The previous Napthine government introduced six month mandatory sentencing laws in 2014 unless there were "special reasons".

The opposition says the laws it introduced in government are not being enforced the way they expected, and is set to release a private member's bill into parliament on Tuesday.

Shadow attorney-general John Pesutto told reporters he wanted to see alcohol and drug abuse excluded from special reasons, but said the opposition was still working on the details around "rare and genuine cases of serious mental illness".

Ambulance Services Minister Jill Hennessy earlier said there was "great disappointment and concern about the lack of accountability last week".

Ambulances have been chalked with slogans against paramedic assaults since the County Court appeal.

But Mr McGhie said the writing would be coming off over the next few days.

Both unions say they have also talked with United Firefighters Union secretary Peter Marshall about the changes and he is supportive.

Australian Associated Press