Influence of temperature on the mean number of phonons for strong-coupling magnetopolaron in an asymmetric quantum dot are studied by using the Huybrechts’ linear combination operator and the LLP variational method. Numerical results indicate that the mean number of phonons for strong-coupling magnetopolaron decreases with increasing temperature. The changes of the mean number of phonons of magnetopolaron changing with the transverse effective confinement strength, longitudinal effective confinement strength, cyclotron frequency and the electron-phonon coupling strength are strongly related to the temperature.