and the opening 135 of the lower press fit hook 132 are arranged in a face to face way or a back to back way in this embodiment the opening 125 of the upper press fit hook 122 and the opening 135 of the lower press fit hook 132 are arranged in a face to face way refer to fig2 a and 2b fig2 b is a diagram schematically showing the assemblage of the power plug structure from another viewing angle the power plug structure of the present invention further comprises a terminal holder 140 having a plate 142 a plurality of electric conduction terminals 144 protrudes from a front face 141 of the plate 142 at least one positioning member 146 is formed on a rear face 143 of the plate 142 and extends out from the plate 142 with an angle existing between the positioning member 146 and the plate 142 as shown in fig2 b a group of press fit holes 148 penetrates the plate 142 the upper press fit hook 122 of the top cover 120 and the lower press fit hook 132 of the bottom cover 130 are inserted into the press fit holes 148 from the rear face 143 of the plate 140 to press fit with the press fit holes 148 as long as the press fit holes 148 can match the upper press fit hook 122 of the top cover 120 and the lower press fit hook 132 of the bottom cover 130 the present invention does.