A power strip includes a power plug and an outlet connected to the power plug through a power cord. The power plug has a plugging face and at least one power pin disposed on the plugging face. The power plug includes a first thermal cut-off device, which has a first thermal sensing pin exposed on the plugging face. The outlet has at least one set of apertures. The first thermal cut-off device is in electrically connection with a power output wire of the power plug. The first thermal cut-off device cuts off the power transmission between the power plug and the outlet when the temperature of the plugging face exceeds a first determined temperature.