The utility model relates to the technical field of road obstacle removing equipment, in particular to an automatic tire holding mechanism and a wrecker, the automatic tire holding mechanism is installed on the wrecker, the automatic tire holding mechanism comprises a base, a tire clamping support and an automatic wheel clamping catch, the automatic wheel clamping catch comprises a set of deflection plates, a clamping plate and a supporting rod, and the clamping plate and the supporting rod are fixed between the two deflection plates. The supporting rod of the automatic wheel clamping chock can drive the deflection plate to deflect downwards when being pressed by a tire, so that the two clamping plates are driven to clamp the two sides of the tire. The automatic tire holding mechanism is installed on the wrecker, the position of the automatic tire holding mechanism can be flexibly adjusted, so that the requirement for the distance between tires of different vehicle types is met, the application range is wide, meanwhile, the automatic wheel clamping catch does not need to be driven by an oil cylinder, a self-weight type pressing mode is adopted, the manufacturing cost is lower, the clamping effect is better, and the automatic tire holding mechanism can meet the clamping requirement for tires of different sizes.