The invention belongs to the technical field of pyrolysis of waste tires and mainly relates to a self-dust-removal type pyrolyzing and cracking system for the waste tires based on regenerative radiant tube heating. The self-dust-removal type pyrolyzing and cracking system is used for preparing clean combustible gases. Aiming at the defects in the prior art, the invention designs and develops a self-dust-removal type pyrolyzing and cracking reaction system for the waste tires. The reaction system can perform two operations of pyrolyzing and cracking; oil gas generated by pyrolyzing enters into a particle bed dust removing device; after the oil gas is subjected to filtering and dust removal, clean oil gas enters a cracking chamber, so that the dust removing pressure of a subsequent process is reduced, and tar macromolecules are cracked into small molecule gaseous hydrocarbons. According to a reactor, a large amount of cracking gases can be generated, thereby solving the problem that produced pyrolytic tar is difficult to utilize, and really realizing clean and efficient utilization of the waste tires.