The invention discloses a solar street lamp controller. The controller comprises a solar cell panel, a storage battery, a lamp, a storage battery voltage monitoring circuit module, a solar cell panel monitoring circuit module and a micro control unit, wherein the storage battery is connected with the solar cell panel to form a charging circuit, and the charging circuit is provided with a first branch circuit, a second branch circuit, a boosted circuit module, a branch circuit control switch module and a charging current monitoring circuit module; the lamp is connected with the storage battery to form an operating circuit, the operating circuit is connected with a pulse width modulation discharging switch control circuit module and a discharging current monitoring circuit module in series; the storage battery voltage monitoring circuit module is arranged at both ends of the storage battery to be connected in parallel with the storage battery; the solar cell panel monitoring circuit module is arranged at both ends of the solar cell panel to be connected in parallel with the solar cell panel; and the micro control unit is used for monitoring and control. The invention has the advantage of more accurate control, and can achieve the energy-saving purpose better.