Charging and discharging control circuit of electric automobile and charging and discharging connection device of electric automobile

The invention is applicable to the field of automobile electronics and provides a charging and discharging control circuit of an electric automobile and a charging and discharging connection device ofthe electric automobile. The circuit comprises switches K1, K2 and S2, and resistors RC and RD, wherein one end of the K1 and one end of the K2 are of a charging null line end and a charging firing wire end respectively; the other ends of the K1 and the K2 are of a discharging null line end and a discharging firing wire end respectively; meanwhile, a null wire end and a firing wire end of a vehicle connection port, a charging ground wire end, a discharging ground wire end and a ground wire end of the vehicle connection port are connected; the ground wire end of the vehicle connection port isconnected with a public end of the S2; a first conducting end and a second conducting end of the S2 are connected with one end of the RC and one end of the RD respectively; the other ends of the RC and the RD are detection end