The invention relates to the technical field of electric light source illumination and specifically discloses a solar power supply double-push injection-locking power synthesis metal halide lamp. Two self-sustained oscillation chips 4, 6 are together connected to a timing resistor and a capacitor for synchronous oscillation. A self-sustained oscillation chip 4, a push-pull amplifier A, an output power transformer T1, a self-sustained oscillation chip 6, a push-pull amplifier B, and an output power transformer T2 are fed into an addition coupler in a reverse-phase way for power synthesis. The synthesized power further undergoes a voltage boost and is then fed into a lamp tube circuit for turning a lamp tube on. Signals of a reference crystal oscillator are injected into RC oscillators of the two self-sustained oscillation chips 4, 6 through a frequency divider for phase locking. Excessive temperature rise of the device, changes of oscillation frequency, imbalanced power and dim light are avoided. A frequency modulation signal generator outputs triangular-wave low-frequency signals which are accessed to RC oscillators of the two self-sustained oscillation chips 4, 6 for suppressing light scintillation in a frequency modulation way. The metal halide lamp is suitably used in illumination occasions as a metal halide lamp powered by a solar heavy-current power supply.