Disclosed is a capacitor mounting structure for a compensation cabinet. The capacitor mounting structure is arranged on a maim frame of the compensation cabinet and comprises a support beam and a capacitor mounting pallet arranged on the support beam. A capacitor is detachably installed on the capacitor mounting pallet, the center of the capacitor mounting pallet is detachably fixed to the support beam through a fastener, and the support beam is fixed on the main frame of the compensation cabinet. According to the utility model, a round capacitor mounting pallet is utilized for installing the capacitor, the bottom of the capacitor mounting pallet is detachably fixed to the support beam through the fastener, when capacitor dismounting operation is carried out, merely by loosening the fastener at the bottom of the capacitor mounting pallet, the capacitor mounting pallet can be rotated, and any one capacitor can be mounted and dismounted, the mounting and dismounting are convenient and fast, the work efficiency can be enhanced, the structure is compact, the occupied space is small, the capacitor mounting structure is especially suitable for use in a compensation cabinet which has narrow space and can only be opened from the front and is also suitable for mounting of multiple small-capacity capacitors in a single-phase compensation system, the structure is simple, and the design is reasonable.