Provided by the present invention are an ablation needle assembly and an ablation system. The ablation needle assembly comprises a hollow insulation sleeve and an ablation needle, and an electrode needle main body of the ablation needle is movably mounted within the insulation sleeve. A distal end portion of the electrode needle main body comprises a first main inclined surface, a proximal end and distal end of the first main inclined surface are respectively located at two opposite sides of the axis of the electrode needle main body, and the distance between the proximal end of the first main inclined surface and the axis of the electrode needle main body is greater than or equal to the distance between the distal end of the first main inclined surface and the axis of the electrode needle body； the angle between the first main inclined surface and the axis of the electrode needle main body ranges from 15° to 60° such that an ablation area at a distal end portion of the electrode needle main body is no longer spherical or nearly spherical, instead being an irregular shape that is skewed toward an opposite side of the first main inclined surface, thereby reducing the maximum width of the ablation area so as to accommodate a flat heart ventricular septum structure, preventing ablation from piercing the endocardium, and being particularly suitable for radiofrequency ablation for hypertrophic cardiomyopathy.La présente invention concerne un ensemble aiguille d'ablation et un système d'ablation. L'ensemble aiguille d'ablation comprend un manchon d'isolation creux et une aiguille d'ablation, et un corps principal d'aiguille d'électrode de l'aiguille d'ablation est monté mobile à l'intérieur du manchon d'isolation. Une partie extrémité distale du corps principal d'aiguille d'électrode comprend une première surface inclinée principale, une extrémité proximale et une extrémité distale de la première surface inclinée principale sont respectivement situées sur deux côtés oppos
