Obrey Nyirenda, officer-in-charge of Ntcheu, said police officers were "ambassadors of the Malawi Police Service", saying: "All we want from you when you go out there, is dedication, integrity and professonalism.
"Know your duties and boundaries," Nyirenda said.
He warned officers against abandoning their posts for non-electoral related activities, stressing the need for officers not to be drunk on duty and not to insult electoral staff and community members.
Nyirenda said that any misconduct against the morals and values of the Malawi Police Service will not be tolerated and culprits will be disciplined accordingly.
"We are a Service that believe in highest degree of discipline, therefore, do not misrepresent the Organisation out there."
He added: "We believe in you, and you have done it responsibly before. Our hope again is that you are going to deliver."
Malawi has deployed thousands of police officers to safeguard the poll in which incumbent President Professor Arthur Peter Mutharika is seking re-election against key challengers Saulos Chilima (UTM), Lazarus Chakwera (MCP) and Atupele Muluzi (UDF).