Abstract: A nail gun with dry fire prevention device includes a gun body, a nail magazine connected with the gun body, a trigger device, and an action assembly. The nail magazine is configured to house at least a nail. The action assembly includes an action member fixed on an outer side of the nail magazine and an operation member pivotally disposed at the action member. The operation member has a first and second portions disposed on two ends of the operation member, respectively. When the nail magazine is empty of the nail, the first portion enters the nail magazine, and the second portion blocks the trigger member, such that the trigger member is unable to be operated. Therefore, the dry fire operation of the nail gun without nails is prevented, improving the convenience of usage and the utility of the nail gun.