Search warrants reveal several guns, a safe with shotgun shells, a bayonet and several swords were found at his home.
The Connecticut prosecutor leading the investigation said Lanza fired 154 bullets from a Bushmaster .223-calibre rifle to kill the 20 students and six adults, before shooting himself with a Glock 10mm handgun.
He added that Lanza had another loaded handgun with him inside the school as well as three, 30-round magazines for the Bushmaster.
A loaded 12-gauge shotgun was also found in the passenger compartment of the car Lanza drove to the school containing 70 shotgun rounds.
The 20-year-old was found dead after the massacre at Sandy Hook Elementary School last December wearing a bulletproof vest and military-style clothing.
Among the other items police seized in their search of the house he shared with his mother were a bolt-action rifle, another pistol and hundreds of rounds of ammunition for a variety of weapons.
Investigators also recovered articles on other shootings and a cheque made out to Adam Lanza for the purchase of a firearm, written by his mother, Nancy.
Lanza shot her in the head at the start of his deadly shooting spree, the warrants revealed.
The home also contained books about living with autism and Asperger's syndrome, as well as an NRA guide to the basics of pistol shooting.
Although detectives list Lanza's journal and other personal documents among the evidence, nothing about the contents is revealed.
Police said they found a smashed computer hard drive and a gaming console.
Lanza, an academically-gifted but emotionally-disturbed young man, was known to be an avid gamer who played Call of Duty and other violent games and rarely left his home.
Some details have been redacted, including the name of a witness, telephone numbers, serial numbers on items found and a few paragraphs of an affidavit.
Authorities have said it will take until June or later for the investigation to be completed.
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