Police in Peru had their spidey senses tingling on Halloween ... because they busted three suspected drug dealers ... with the help of an undercover officer in costume as Spider-Man!

Check out this video from the National Police of Peru ... you see the Spider-Man cop and some of his fellow agents busting into a home and arresting a criminal group known as "Los Diabolicos de Malambitoo." X/@PoliciaPeru

The three folks who were arrested on Halloween by Spider-Man and Co. were allegedly involved in drug trafficking ... and police say they seized 2,100 packets of cocaine paste and a bunch of cash. X/@PoliciaPeru

Police posed with their haul after the big drug bust ... and the cop was still wearing his Spider-Man costume. X/@PoliciaPeru

No word if the guy behind the mask is Peter

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