The invention provides a jaw-type pipe coupler with a simple structure, which comprises a flange body which is welded at the end part of a pipe to be coupled and fixed with an end cover of the coupler; the end cover of the coupler is fixedly connected with a seal gland; jaws are evenly distributed around the flange body; a jaw drive ring is arranged between the jaws and the seal gland; the pipe to be coupled is fixed with a round plate which is connected with an outer sleeve of a jaw connecting device; a drive hydraulic cylinder is arranged on the round plate; a rod of the drive hydraulic cylinder is connected with an annular plate; and a convex ring of the jaw drive ring is clamped in an annular groove of the annular plate. The jaw-type pipe coupler is used for fast automatic coupling of pipes in deep-water ocean, which causes the jaws to be located accurately, reduces impact on original jaws during moving, greatly simplifies the mechanism of the jaw-type coupler, realizes the possibility of production and serialization, requires no grasping force continuously provided by the outside when connecting the jaws, and realizes reliable grasping by the self-locking of the drive ring and the combination surface of the jaws.