The invention relates to a solar greenhouse roof intelligent ventilation system and a control method thereof. The solar greenhouse roof intelligent ventilation system comprises a scissor fork type ventilation device, a ventilation opening sealing device and an intelligent control system. The scissor fork type ventilation device comprises a fixing support, a scissor fork frame, a ventilation opening push rod motor, a limiting sliding rail, a limiting pulley, a microswitch and a film fixing groove; the ventilation opening sealing device comprises a transfer rod push rod motor, a transmission shaft, a limiting bearing, a sealing rod, a transfer rod and a scissor fork type transmitter; the intelligent control system comprises a temperature sensor, a raindrop sensor, a touch screen, a PLC and a power adapter. On the basis of different requirements for temperature of different crops at different growth periods, whether ventilation is performed or not is judged not depending on a simple temperature threshold value; on the basis of environment data collected by the PLC according to the temperature and raindrop sensors, whether or not the effective accumulative temperature reaches the preset lower limit within the crop growth periods and whether it rains or not, the increase and decrease amplitude of the transient temperature and other factors are comprehensively considered, movement of the ventilation opening push rod motor and the transfer rod push rod motor is controlled, and therefore opening and closing of a ventilation opening are controlled.