The invention discloses a power catwalk pipe column measuring and controlling device which comprises a displacement detection unit, an induction trigger unit I, an induction trigger unit II, an arithmetic unit and an operation interface, wherein the displacement detection unit, the induction trigger unit I and the induction trigger unit II are respectively in signal connection connected with the arithmetic unit; the arithmetic unit is in signal connection with the operation interface. The invention further discloses a power catwalk pipe column measuring and controlling method which comprises the following steps: calculating the length of a pipe column and controlling the extension length of the pipe column in a process of conveying the pipe column in a catwalk. According to the power catwalk pipe column measuring and controlling device and the power catwalk pipe column measuring and controlling method, support is supplied to other pipe column processing equipment, halt and onsite visual measurement are not needed, the power catwalk is more intelligent, one-key operation is conveniently realized, and the calculated value can be used for software programming of the other pipe column processing equipment and full-process automation control.