Air conditioner and outdoor unit thereof

The invention provides an air conditioner and an outdoor unit thereof. The outdoor unit of the air conditioner comprises an electronic control box and a connecting panel; the electronic control box comprises a box body and a mainboard, the mainboard is arranged in the box body, a side surface of the box body covers an electronic control panel, and a first maintenance window is arranged on the electronic control panel and corresponds to the mainboard; a second maintenance window is arranged on the connecting panel and corresponds to the first maintenance window. The air conditioner and the outdoor unit have the advantages that the outdoor unit of the air conditioner can be quickly and conveniently debugged or maintained by operators without detaching the connecting panel, the labor intensity of the operators is reduced, and the debugging accuracy is improved.