An optical detection circuit, comprising: a photosensitive detector, configured to accumulate photo-generated charges at a first node when being irradiated by light; a transmitting circuit, configured to establish a current path to the first node in response to a first scanning signal being effective; an integral circuit, configured to selectively operate in a first mode or a second mode, in the first mode, the integral circuit being operated as an integrator to integrate photocurrent and transmit the integration result to a second node for readout, and in the second mode, a first input end of the integral circuit being conducted with the second node; and a reset circuit, configured to selectively supply a first voltage or a second voltage to a second input end of the integral circuit as a reference voltage. The second voltage is greater than the first voltage.