The invention discloses an illumination lamp which comprises a lamp holder, a luminescence module, a power supply module and a circuit module, wherein the lamp holder comprises a shell unit and an isolation unit; the shell unit defines an internal space; the isolation unit is arranged in the shell unit and divides the internal space into a first space zone and a second space zone, wherein the first space zone is used for containing the power supply module; the second space zone is used for containing the circuit module; heat convection between the first space zone and the second space zone can be blocked by the isolation unit; and the influence on the power supply module by the high temperature of the circuit module is lowered.