A control method for tracking a maximum power point of a solar cell , wherein an output voltage of the solar cell is converted to a voltage required by a load via a conversion module comprising a switching unit , and the control method comprises: acquiring the open-circuit voltage of the solar cell by acquiring an outdoor environment temperature, and calculating a change rate of the outdoor environment temperature, and periodically collecting the open-circuit voltage of the solar cell according to the change rate of the outdoor environment temperature; wherein the cycle of periodic collection of the open-circuit voltage is shortened when the change rate is high and the outdoor environment temperature is changing quickly, and wherein the cycle of periodic collection of the open-circuit voltage is prolonged when then change rate is low and the outdoor environment temperature is changing slowly; adjusting a duty ratio of the switching unit such that the output voltage of the solar cell decreases from the open-circuit voltage gradually in a first change direction; reversely adjusting the duty ratio of the switching unit when the output voltage of the solar cell is less than a preset voltage, such that the output voltage of the solar cell changes in a second change direction, wherein the preset voltage is less than an output voltage corresponding to a maximum power of the solar cell , and the first change direction is opposite to the second change direction; calculating a current output power of the solar cell , and comparing the current output power of the solar cell with a previous output power; and determining the previous output power as a maximum output power of the solar cell when the current output power is less than the previous output power. acquiring the open-circuit voltage of the solar cell by acquiring an outdoor environment temperature, and calculating a change rate of the outdoor environment temperature, and periodically collecting the open-circuit voltage of the solar cell according to the change rate of the outdoor environment temperature; wherein the cycle of periodic collection of the open-circuit voltage is shortened when the change rate is high and the outdoor environment temperature is changing quickly, and wherein the cycle of periodic collection of the open-circuit voltage is prolonged when then change rate is low and the outdoor environment temperature is changing slowly; adjusting a duty ratio of the switching unit such that the output voltage of the solar cell decreases from the open-circuit voltage gradually in a first change direction; reversely adjusting the duty ratio of the switching unit when the output voltage of the solar cell is less than a preset voltage, such that the output voltage of the solar cell changes in a second change direction, wherein the preset voltage is less than an output voltage corresponding to a maximum power of the solar cell , and the first change direction is opposite to the second change direction; calculating a current output power of the solar cell , and comparing the current output power of the solar cell with a previous output power; and determining the previous output power as a maximum output power of the solar cell when the current output power is less than the previous output power. <EOS>