The invention discloses a power switch cabinet mounting chassis, comprising a bottom plate and two fixing supports, wherein the two fixing supports are arranged in parallel along the length of the bottom plate, each fixing support is provided with a plurality of positioning slots, a positioning buckle is arranged in each positioning slot, the buckles can be used with rollers at the bottom of a switch cabinet, and the shape and size of the buckles are engaged with the rollers. The power switch cabinet mounting chassis accelerates the production speed of various components of the switch cabinet,is convenient to install and saves manpower.