A chemical ablation apparatus for treating arrhythmia, comprising: a clamp body (15), a clamp head (120) consisting of a pair of clamp jaws (17, 19), a needle head assembly, a needle head extension and retraction control assembly, pipeline components, and an electrocardiographic mapping component. The chemical ablation apparatus can control needle heads to extend out of or retract into the clamp head by means of the needle head extension and retraction control assembly. A chemical ablation reagent is injected to cardiac muscle tissue so as to conveniently achieve complete ablation of the cardiac muscle tissue by applying a chemical ablation method. The ablation effect can be verified by an electrocardiographic mapping system, thereby increasing the success rate of arrhythmia ablation operations, lowering difficulty level of the operations, and meanwhile, reducing manufacturing cost of ablation apparatus and corollary equipment thereof, and decreasing expenses for atrial fibrillation surgical operations.
