Abstract: In order to overcome the current runaway phenomenon of the traditional BOOST structure solar energy collection circuit under some conditions, a dynamically switchable light source resistor is introduced into the collection circuit, the resistance value of the light source resistor is used to limit the current runaway, the illumination of the light source resistor is used to improve the power generation capacity of the photovoltaic cell, and the output power of the photovoltaic cell is maximized through MPPT control. The theoretical analysis and simulation results show that the improved BOOST structure solar energy collection circuit can work near its MPPT working point in the whole process under the MPPT control, and has the maximum power output in the whole process.