A control method of display power supply, applied to a thin film transistor display screen comprising a drive IC and a screen body, the drive IC controlling the screen body to display a corresponding image and outputting a gate negative voltage and a gate positive voltage, and the screen body controlling a pixel via a thin film transistor; the control method comprising: controlling a power supply of the drive IC to power up according to a set rule after receiving a start signal, the set rule aiming at reducing a probability of abnormality in a voltage outputted by the drive IC; supplying power continuously to the drive IC; wherein the drive IC comprises a power management circuit, the power management circuit including a reference voltage source, a charge pump, and a low dropout regulator, and the controlling the power supply of the drive IC comprises: controlling a power supply voltage input to the power management circuit to power up according to the set rule after receiving the start signal for reducing the probability that the gate driving negative voltage outputted by the drive IC is abnormally raised; characterized in that the controlling the power supply voltage input to the power management circuit comprises: controlling the power supply voltage input to the power management circuit to power up to a first level after receiving the start signal; controlling the power supply voltage input to the power management circuit to reduce to a second level after a first time period, the second level being lower than the first level; and controlling the power supply voltage input to the power management circuit to rise again to the first level after a second time period; wherein the first level sustains between 2.5V and 4.8V, and the second level sustains between IV and 2.2V. the control method comprising: controlling a power supply of the drive IC to power up according to a set rule after receiving a start signal, the set rule aiming at reducing a probability of abnormality in a voltage outputted by the drive IC; supplying power continuously to the drive IC; controlling a power supply of the drive IC to power up according to a set rule after receiving a start signal, the set rule aiming at reducing a probability of abnormality in a voltage outputted by the drive IC; supplying power continuously to the drive IC; wherein the drive IC comprises a power management circuit, the power management circuit including a reference voltage source, a charge pump, and a low dropout regulator, and the controlling the power supply of the drive IC comprises: controlling a power supply voltage input to the power management circuit to power up according to the set rule after receiving the start signal for reducing the probability that the gate driving negative voltage outputted by the drive IC is abnormally raised; characterized in that the controlling the power supply voltage input to the power management circuit comprises: controlling the power supply voltage input to the power management circuit to power up to a first level after receiving the start signal; controlling the power supply voltage input to the power management circuit to reduce to a second level after a first time period, the second level being lower than the first level; and controlling the power supply voltage input to the power management circuit to rise again to the first level after a second time period; controlling the power supply voltage input to the power management circuit to power up to a first level after receiving the start signal; controlling the power supply voltage input to the power management circuit to reduce to a second level after a first time period, the second level being lower than the first level; and controlling the power supply voltage input to the power management circuit to rise again to the first level after a second time period; wherein the first level sustains between 2.5V and 4.8V, and the second level sustains between IV and 2.2V.