The utility model relates to a dustproof device, belongs to the technical field of power supply modules, and particularly relates to a dustproof shell for a power supply module, which comprises a shell, a protective door hinged on the shell and a heat dissipation
assembly, and the heat dissipation
assembly comprises a fan and a filter screen. According to the utility model, the heat dissipation
assembly is matched with the first fixing plate, the through hole, the fan, the filter screen, the second fixing plate and the ventilation opening, the fan is used for dissipating heat of the
power module in the shell, the filter screen is used for filtering, the dustproof effect is achieved, and the
power module is fixed in the shell in a suspended manner, so that the periphery of the
power module can be blown; and the fixing assembly is matched with a two-way screw rod II through a sliding plate, a threaded block, a
threaded rod, a two-way screw rod I, a clamping seat, a connecting plate and the two-way screw rod II, and the distance between the clamping seats is adjusted through rotation of the two-way screw rod I, the two-way screw rod II and the
threaded rod so as to adapt to power modules with different widths, lengths and heights, so that the practicability of the device is higher.