The invention discloses a connection detection device for an electric automobile charging socket. The connection detection device comprises one resistance or voltage detection device, a first lead, a first gating mechanism, and a second gating mechanism. The first lead is from a charger to a battery, and one end of the first lead is connected with the detection device. The first gating mechanism is used for selectively connecting one end of each lead in a charging passage with the detection device. The second gating mechanism is used for selectively connecting the other end of each lead in the charging passage with the other end of the first lead. The first lead, the first gating mechanism and the second gating mechanism jointly provide testing connection of any conductive passage for the resistance or voltage detection device. Detection of resistance or voltage drop from the charger to each lead of the battery can simply and directly indicate whether safety hidden troubles exist or not, so that a charging conductive passage is enabled to be monitored, and safety hidden troubles of the charging conductive passage can be eliminated.