Power metering box with moisture-proof function

The invention discloses a power metering box with a moisture-proof function. The power metering box comprises a casing. A top of the casing is provided with a groove communicating with the outside, insertion slots are formed on two sides of the groove at the top of the casing, a top protection mechanism is arranged above the insertion slots, a surface of the casing is provided with an inlet groovecommunicating with the inside of the casing, a bottom of the inlet groove on the surface of the casing is provided with a limit groove, and a surface protection mechanism is set on the casing on thelimit groove. According to the power metering box, by setting the top protection mechanism, the damage to a power metering box body caused by that vapor enters into the casing from the top in rainingdays is prevented, at the same time, the interaction between air inlet holes of sides and a micro fan enables the air circulation of the casing and the outside, excessive pressure caused by the no circulation of air inside is p