The invention relates to the technical field of cardiac electrophysiology ablation catheters, and discloses an intracardiac ultrasound catheter with ablation and mapping functions, which comprises an ultrasound catheter assembly, the ultrasound catheter assembly comprises an ultrasound catheter, an adjuster is mounted at the middle end of the ultrasound catheter, one end of the adjuster is fixedly connected with a control handle, and the other end of the adjuster is fixedly connected with a probe. An adjusting knob is arranged on the outer side wall of the control handle, and a conversion connector is installed at the tail end of the control handle. According to the catheter for the electrophysiological surgery, only one blood vessel can be punctured, in addition, the ultrasonic catheter and the ablation catheter are arranged together, the necrosis and edema conditions of cells after ablation in the surgery can be monitored in real time, the ablation catheter can more accurately ablate abnormal parts, and the catheter for the electrophysiological surgery integrates the functions of intracardiac ultrasound, three-dimensional reconstruction and ablation, so that the ablation surgery is more convenient and faster; and in addition, the ablation curative effect is quantitatively evaluated in real time during the operation, so that the ablation treatment is more accurate, and the postoperative recurrence rate can be reduced.