The invention relates to the technical field of heat dissipation of power distribution cabinets, in particular to a low-
voltage power distribution cabinet for buildings, which comprises a cabinet body, an object placing plate is fixedly connected in the cabinet body, a power distribution element main body is placed at the upper end of the object placing plate, and the low-
voltage power distribution cabinet further comprises a rainy day heat dissipation
assembly which comprises a water collecting hopper fixedly connected at the upper end of the cabinet body. Different heat dissipation
modes are provided for different weathers, water-cooling heat dissipation is adopted in heavy rain weather, fan blades are driven by
wind power to rotate in windy weather to generate
electricity for heat dissipation of heat pipes,
natural ventilation heat dissipation is achieved through heat dissipation holes in normal weather, and forced ventilation heat dissipation can be achieved through a heat dissipation fan besides the first sealing plate and the second sealing plate are opened to increase
convection in high-temperature weather; heat dissipation
modes can be flexibly switched according to different weather conditions, the automatic adjusting
assembly and the valve can automatically adjust the drainage path in rainy days, it is ensured that rainwater in the water collecting hopper can be smoothly drained, and meanwhile the heat dissipation function and the dustproof and rainproof function of the device are guaranteed.