An LTPS semiconductor thin-film transistor-based GOA circuit. A resistor R1 and a timing signal Reset are introduced to adjust high and low levels and the frequency of a voltage corresponding to a second node P(n). The resistor R1 and a tenth thin-film transistor T10 are employed to replace a second capacitor C2 in the prior art. One terminal of the resistor R1 is connected to a constant voltage high level VGH; the other terminal is connected to a gate terminal of a ninth thin-film transistor T9; and a source terminal of the ninth thin-film transistor T9 is electrically connected to the timing signal Reset. When an output terminal G(n) is in a stage of maintaining a low level, the level of the second node P(n) follows transitions of the timing signal Reset between high and low levels and make identical transitions between high and low levels, that is, the level of the second node P(n) is pulled down according to a certain frequency, thus effectively preventing the second node P(n) from being in the high level for an extended period of time, avoiding the problem of threshold voltage shift as a result of sixth and seventh thin-film transistors T6 and T7 working for an extended period of time, and increasing the stability of the GOA circuit.