Wide-capacitance standard loss box

A wide-capacitance standard loss box comprises a box body, a change-over switch, a loss value selection switch, a standard loss box output interface and a physical capacitor, the standard loss box output interface is arranged on the outer side of the box body, and the change-over switch is electrically connected with the standard loss box output interface; the change-over switch is used for switching connection between the output interface of the standard loss box and the measuring circuits, the number of the measuring circuits is n, and n is an integer greater than or equal to 2; and each measuring circuit comprises a physical capacitor and a plurality of variable resistors which are connected in series. According to the utility model, the plurality of groups of measuring circuits are arranged, and standard loss value output corresponding to a plurality of capacitances is realized at the same frequency point, so that the output range of the standard loss box is wider, and the transmission quantity value rang