Abstract: Fat weighing scale including a reinforced glass or acry-made square step board and a display panel and several control buttons arranged on front side of the step board. The display panel is connected to internal control chip set and cells. The center of the step board is provided with a conductive section which is connected with the control chip set in the display panel. An upper cover and a seat body are mated with each other on each corner of the step board. Each seat body is co-used with a transmission sensor, a switch seat, a restoring spring, a press leg, a press leg seat and a seat cover mated with the seat body. The transmission sensor is connected with a control chip connected to the control chip set of the display panel. Two conductive wires are wound between two seat bodies on two sides of the step board to serially connect the same. The switch seat is drivingly connected under the transmission sensor and provided with a switch at the center. The press leg is a case having a central projecting post.