The invention provides a vapor generator suitable for a lead and bismuth reactor and nuclear equipment. The vapor generator comprises a vapor generator shell. A C-shaped opening used for containing amain pump is arranged on one side of the vapor generator shell. Multiple heat exchange pipes are evenly distributed in a cavity in the vapor generator shell. A water inlet chamber, a vapor chamber anda heat exchange chamber are sequentially arranged in the cavity in the vapor generator shell from top to bottom. A self water supply opening is formed at the position, at the water inlet chamber, ofthe vapor generator shell. A vapor outlet is arranged at the position, at the vapor chamber, of the vapor generator shell. Lead and bismuth liquid inlets communicating with the main pump are arrangedat the position, on the upper portion of the heat exchange chamber and at the C-shaped opening, of the vapor generator shell. A lead and bismuth liquid outlet is arranged at the bottom of the heat exchange chamber. According to the vapor generator, the possibility that lead and bismuth liquid is leaked to enter a secondary hoop in the operation process of the vapor generator of the lead and bismuth reactor can be effectively reduced, the safety of the vapor generator of the lead and bismuth reactor can be improved, and under the condition that the heat exchange pipes of the secondary hoop aredamaged, equipment safety is still guaranteed.