The invention relates to the technical field of low-voltage power distribution cabinets, in particular to a plate-type assembled low-voltage power distribution cabinet free of screw fixation. The cabinet comprises a lower cabinet shell which is of a rectangular box structure without an upper surface. A middle cabinet shell is clamped above the lower cabinet shell. An upper cabinet shell is clampedabove the middle cabinet shell. The middle cabinet shell and the upper cabinet shell are each of a rectangular frame structure. The height of the middle cabinet shell, the height of the upper cabinetshell and the height of the lower cabinet shell are consistent. Screw installation is omitted, a splicing mode is directly adopted, the joint is not prone to rust, and the service life of the cabinetbody is prolonged. Screw installation is omitted, the purpose of rapid splicing is achieved, and the cabinet is simple and convenient to use. A water collecting hopper is arranged at the upper end ofthe upper cabinet shell, the water collecting hopper can collect rainwater and is used for evaporating water vapor to take away heat in hot weather, the purpose of naturally and rapidly cooling the top of the upper cabinet shell is achieved, and the heat dissipation performance is good.