In his speech, the party leader was critical of police being able to report a crime as "solved" even if it means the investigation has been dropped.
Reinfeldt said he wanted tougher punishments for crimes such as home break-ins, and that he wants to change rules that allow police to probe only some reported crimes and not all.
The Prime Minister also brought up internet slander and bullying, saying crimes committed on the web cannot be "immune from punishment," and that he would like to start a national centre for IT crime.
The conservative Moderates, who have been the largest party in Sweden's centre-right government coalition since 2006, have a history of focusing on crime and punishment.
Borg denies party leadership ambitions
At the Moderate Party meeting on Friday, Finance Minister Anders Borg denied rumours that he will take over as party leader once Fredrik Reinfeldt steps down.