Waterproof small-sized transformer

The utility model relates to the technical field of transformers, and discloses a waterproof small-sized transformer, which comprises a transformer main body capable of performing voltage conversion, current conversion, impedance conversion, isolation and voltage stabilization. The waterproof box is mounted on the transformer main body, and the transformer main body is mounted in the waterproof box and can resist water for the transformer main body; the waterproof heat dissipation mechanism is connected to the waterproof box, and the waterproof heat dissipation mechanism comprises a first air inlet channel, a second air inlet channel and an air outlet channel. According to the small waterproof transformer, when the air humidity is high, air is conveyed into the box body through the second air inlet channel, hot air is conveyed outwards through the air outlet channel, most of water in the air is removed through the water removal assembly in the process, and meanwhile heat on the air outlet channel is transferr