Pixel driving circuit and driving method therefor and display panel

A pixel driving circuit, comprising:

• a first reset module, connected to a first node, a first initialization signal terminal and a reset signal terminal, wherein the first reset module is configured to write a signal of the first initialization signal terminal into the first node in response to a signal of the reset signal terminal;
• a driving module, connected to the first node, a second node and a third node, wherein the driving module is configured to provide a driving current to the third node based on voltages of the first node and the second node;
• a coupling module, connected to the first node and a preset node, wherein the coupling module is configured to couple a voltage change of the first node to the preset node and couple a voltage change of the preset node to the first node;
• and
• a first switch module, connected to a constant voltage terminal, the preset node and a switch signal terminal, wherein the first switch module is configured to turn on in response to a signal of the switch signal terminal to stabilize the preset node using the constant voltage terminal or to turn off in response to the signal of the switch signal terminal to control the preset node to float.