Active heat dissipation electric power metering box with high temperature alarm function and heat dissipation method

The invention relates to the technical field of metering boxes, in particular to an active heat dissipation electric power metering box with a high temperature alarm function and a heat dissipation method. Comprising a shell, and an isolation cover is slidably arranged at the bottom in the shell through springs; a static top shell is arranged at the top of the shell, a dynamic top shell is arranged at the top of the static top shell, and a flow guide cover is arranged in the static top shell; second convection holes are formed in the periphery, close to the bottom of the isolation hood, of the bottom of the shell. The second convection hole is used for draining water, and meanwhile, due to the fact that the height difference exists between the second convection hole and the first convection hole, pressure difference is formed, and air flow below conveniently enters the space between the shell and the isolation hood from the second convection hole and then is discharged to the outside through the first convect