The invention discloses a metering box convenient for heat dissipation, which comprises a shell. Mounting blocks are fixedly connected to the bottoms of the left side and the right side of the shell,fans are fixedly connected to the tops of the mounting blocks, air inlet pipes are fixedly connected to the tops of the fans, air outlet pipes are fixedly connected to the sides, close to the shell, of the fans, and the sides, away from the fans, of the air outlet pipes penetrate through the shell and extend into the shell to be sleeved with sleeves. Through mutual cooperation of the fan, the airinlet pipe, the air outlet pipe, the sleeve, a hose, an exhaust head, a balancing weight, a sliding rod, a sliding block, a through hole, a rolling pulley, a rotating motor, a rotating shaft, a forward rotating threaded rod, an annular block, a reverse rotating threaded rod, a threaded block, a fixing block, a sliding groove, a sliding block and a fixing rope, the effect of convenient heat dissipation is achieved, the problem that the metering box is inconvenient to dissipate heat is solved, local melting of a wire cannot be caused in a high-temperature environment, the service life of internal elements of the metering box is prolonged, and great convenience is brought to a user.