Attorney General Githu Muigai's comments came a day after the United States urged Odinga's supporters to call off the mock "swearing-in" on December 12, the country's independence day. Treason charges attract the death sentence in Kenya.
Prof Muigai went on to add that if an inauguration is not overseen by Chief Justice David Maraga is null, void and illegal. "The criminal law of the Republic of Kenya stipulates that sort of process is high treason". "It is high treason of the persons involved, and any other person facilitating that process".
Police have disputed Nasa tallies in the past, saying only a few dozen people died in clashes that rocked Nairobi and several counties in western Kenya.
Mr Odinga said the government owes an apology to all families whose loved ones were felled by police bullets.
Odinga and Kenyatta faced off in an election in August that Kenyatta won.
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Raila Odinga (third left) and other Nasa leaders attend prayers for people who were killed during post-poll chaos at the City Mortuary in Nairobi.
A US Embassy statement on Wednesday called Mr Odinga's planned protest event on December 12 "extra-constitutional" and urged him to cancel the event. "Don't come and shout at us and tell us that we are violating the constitution".
Many Kenyans are challenging Kenyatta's sweeping victory in the October rerun elections, which saw a low turn-out, and once again claiming fraud.
"We thought we had friends but we were wrong and now we know they are enemies".
Prof Muigai said the government would not stop at anything to prevent the breach of the rule of law and the constitution.