The invention provides a simple type elevator shaft inner protective structure and a construction method thereof, and belongs to the technical field of safety in building construction.The simple typeelevator shaft inner protective structure comprises first steel pipes, at least two second steel pipes and third steel pipes, wherein the at least two second steel pipes are arranged side by side in sequence. The second steel pipes are fixedly connected through the third steel pipes. Each first steel pipe is fixed to the lower side of one end of the corresponding second steel pipe, and a distanceis reserved between each first steel pipe and one end of the corresponding second steel pipe. The distance from the joints of the first steel pipes and the second steel pipes to the other ends of thesecond steel pipes is larger than the depth of an elevator shaft. Support plates are laid on the upper side of the structure formed by the second steel pipes and the third steel pipes. The situation that an opening is formed in the elevator shaft in an early stage and then is repaired in a later stage is avoided, and the leakage risk is avoided. The construction method is simple in operating, materials are convenient to obtain, the structure is firm, safety is high, and the deficiency of the prior art is overcome.