The invention discloses a damping mounting seat. The damping mounting seat comprises a mounting base, a fixing plate, downward pressing plates and supporting columns. The mounting base is provided with embedded grooves and vertical column holes located above the embedded grooves; a plurality of rubber damping balls are tiled at the bottoms of the embedded grooves of the mounting base, and the downward pressing plates are arranged in the embedded grooves and located above the rubber damping balls; vertical columns are arranged in the vertical column holes, and the bottoms of the vertical columns are fixedly connected with the downward pressing plates; the mounting seat is further provided with a limiting buffer cavity; the fixing plate is connected with the upper ends of the vertical columns, a sliding rod is further arranged on the fixing plate, and the sliding rod is arranged in the limiting buffer cavity of the mounting seat in a penetrating mode; a lower baffle is arranged at the bottom of the limiting buffer cavity, and an upper baffle is arranged on the position, located at the upper part of the limiting buffer cavity, of the sliding rod; and a pressing spring is arranged on the position, between the upper baffle and the lower baffle, of the sliding rod. The damping mounting seat improves the damping effect of a car-mounted air conditioner compressor and reduces the damageprobability of the compressor.