The invention provides a pulse forming circuit and an LTD module. The pulse forming circuit comprises an input end, an output end, a discharge switch and a pulse forming network. The discharge switchand the pulse forming network are connected in series between the input end and the output end; the discharge switch comprises an insulated gate bipolar transistor switch and a drive circuit. The driving circuit is electrically connected with the insulated gate bipolar transistor switch; and the driving circuit is used for providing a trigger signal for the insulated gate bipolar transistor switch. According to the invention, the discharge switch employing the insulated gate bipolar transistor switch is longer in service life and more stable in operation.