An outdoor unit of an air conditioner, comprising: a casing ; and an electric control assembly being disposed in the casing ; wherein the outdoor unit comprises a main control board and a filter board arranged side by side in a horizontal direction, and the electric control assembly comprises: a wire mounting plate sheet metal located below the main control board and the filter board and provided with a power line terminal block ; and an electric control board disposed on the wire mounting plate sheet metal and provided with a wiring socket and a signal line terminal block , wherein the wiring socket , the signal line terminal block , and the power line terminal block are arranged sequentially in a direction from the main control board to the filter board ; wherein the the outdoor unit further comprising a middle partition plate disposed in the casing , and configured to partition an interior of the casing into a first chamber and a second chamber , a fan wheel being provided in the first chamber , characterized in that the electric control assembly comprises a wiring component and an electric control component , the wiring component comprises the wire mounting plate sheet metal and the electric control board , the wiring component is vertically arranged in the second chamber and located below the electric control component , and a wire body on the electric control component is connected to the wiring component ; and an electrically controlled welding member disposed on the top of the middle partition plate , the electric control component being inverted in the electrically controlled welding member and configured to span the first chamber and the second chamber . a casing ; and an electric control assembly being disposed in the casing ; wherein the outdoor unit comprises a main control board and a filter board arranged side by side in a horizontal direction, and the electric control assembly comprises: a wire mounting plate sheet metal located below the main control board and the filter board and provided with a power line terminal block ; and an electric control board disposed on the wire mounting plate sheet metal and provided with a wiring socket and a signal line terminal block , wherein the wiring socket , the signal line terminal block , and the power line terminal block are arranged sequentially in a direction from the main control board to the filter board ; a wire mounting plate sheet metal located below the main control board and the filter board and provided with a power line terminal block ; and an electric control board disposed on the wire mounting plate sheet metal and provided with a wiring socket and a signal line terminal block , wherein the wiring socket , the signal line terminal block , and the power line terminal block are arranged sequentially in a direction from the main control board to the filter board ; wherein the the outdoor unit further comprising a middle partition plate disposed in the casing , and configured to partition an interior of the casing into a first chamber and a second chamber , a fan wheel being provided in the first chamber , characterized in that the electric control assembly comprises a wiring component and an electric control component , the wiring component comprises the wire mounting plate sheet metal and the electric control board , the wiring component is vertically arranged in the second chamber and located below the electric control component , and a wire body on the electric control component is connected to the wiring component ; and an electrically controlled welding member disposed on the top of the middle partition plate , the electric control component being inverted in the electrically controlled welding member and configured to span the first chamber and the second chamber . <EOS>