The invention relates to the field of electrical design, and discloses a thermostatic silent cabinet, which comprises an internal rack, a main body frame and a shell, wherein the main body frame is arranged in the shell; the internal rack is arranged on the main body frame; an interlayer is arranged on each of the six surfaces of the shell; soundproof cotton is arranged in each interlayer; outlet holes are reserved on an upper top plate and a lower bottom plate of the shell; detachable sealing caps are arranged on the outlet holes; a ventilation air duct is also formed in the interlayer of the shell; an air inlet and an air outlet of the ventilation air duct are communicated with the interior of the internal rack and the outside of the shell; a plurality of diversion barriers are arranged in the shell, and are arranged between the air inlet and the air outlet respectively; and each diversion barrier is extended from an inner cavity of the shell, and is obliquely arranged along a direction from the air inlet to the air outlet. By using the technical scheme, equipment noise, electromagnetic radiation and external dust can be effectively blocked, and good ventilation and radiation effects are kept.