The invention discloses a high-strength bridge deck crack repairing method, which belongs to the technical field of bridge deck construction. The method comprises the following steps: reasonably expanding a crack, uniformly punching holes in the side wall of the crack, injecting magnetic concrete, bridging two adjacent holes in a self-connecting piece put into the crack on the basis of a magneticattraction effect, triggering self-anchoring ball on the self-connecting piece to make a gap, a chemical reaction being controlled to be generated and stopped, then the propelling effect of gas beingcontrolled. High-frequency impact is formed in a hole through the punching column to achieve punching, finally, after punching is finished, the bonding action is triggered, and the punching column isforced to be in multi-point deep connection with the hole wall permanently. Then repairing concrete is injected into the cracks, on one hand, the repairing concrete enters the self-connecting piece tobe reinforced and shaped, on the other hand, the cracks are filled, the connecting effect on the bridge floor on the two sides of the cracks is formed after forming, a tensile force is given all thetime, the secondary cracking phenomenon is avoided, and the repairing strength is greatly improved.