The utility model discloses a high-pressure manifold magnetic flux leakage detector based on omnidirectional wheels, and relates to the technical field of high-pressure manifold magnetic flux leakagedetection equipment in the petroleum drilling industry. The device comprises an excitation mechanism, a walking mechanism based on an omnidirectional wheel and a signal acquisition module, and the excitation mechanism is used for generating an excitation magnetic signal and magnetizing a measured pipe fitting; the signal acquisition module is in bolted connection with the excitation mechanism andis used for receiving or sensing the magnetic signal; the walking mechanism based on the omnidirectional wheels is connected with the excitation mechanism through bolts in a fastened mode. Omnidirectional wheels are adopted and can move in the axial direction and the circumferential direction of the high-pressure manifold, the high-pressure manifold can directly slide by one scanning width to be detected next time without taking down an instrument after one-time detection, online detection can be conducted on the pipe fitting, operation is convenient and rapid, and the detection efficiency canbe improved.