The invention relates to a marine tube cable shape monitoring system, aims to provide a tube cable with a deformation self-checking function. Four resistance-type bending sensors and eight resistance-type bending sensors form a bending detection unit in the cross section direction of the tube cable in a vulcanized rubber layer of the tube cable, a plurality of groups of bending detection units are equidistantly arranged along the length direction of the tube cable, each bending detection unit comprises an ADC (analog to digital converter) sampling circuit, a 485 bus interface and eight reference resistors, the bending detection units are parallelly connected to a microcontroller, and the microcontroller is connected to a main control computer through a cable. Deformation conditions of the tube cable can be supervised in real time, an alarm of excessive deformation is given according to a set value, an additional third visual angle monitoring device is omitted in the process, auxiliary device requirements can be furthest simplified, and the tube cable is similarly applicable to monitoring fields of various cable systems such as mine engineering and tunnel engineering.