The invention relates to a refrigerating device installing device, in particular to a fixing device for air conditioner copper pipe fusion welding. According to the technical purposes of the fixing device for air conditioner copper pipe fusion welding, during copper pipe fusion welding, butt joint is easy, an operator is not likely to be scalded, and the fusion welding effect is guaranteed. In order to achieve the technical purposes, the fixing device for air conditioner copper pipe fusion welding is provided, and comprises a base, an L-shaped support, an electric pushing rod, an upper clamping block, an angle adjusting device and the like; the L-shaped support is vertically connected to the position, close to the left, of the middle of the top of the base; the front side of the middle portion of the L-shaped support is provided with a clamping groove; and the electric pushing rod is vertically installed on the top of the inner side of the L-shaped support. According to the fixing device for air conditioner copper pipe fusion welding, when fusion welding is performed on a copper pipe, the angle of fusion welding can be adjusted, and can be accurately adjusted, the copper pipe is clamped through a clamping device, so that the copper pipe is not prone to movement during fusion welding, and the fusion welding effect is improved; and the angle of copper pipe fusion welding can be faster and more conveniently adjusted through a walking mechanism.