The invention provides a cable-free linear motor feeding system, and belongs to the technical field of mechanical equipment. According to the cable-free linear motor feeding system, a main groove anda side groove are formed in a marble pedestal, the side groove serves as an air guideway to support a load assembly to move, throttling holes are formed in the three surfaces of the side groove correspondingly, a water cooling plate is made of a non-permeability-magnetic material and is arranged at the bottom of the main groove of the pedestal, a water channel pipeline is arranged in the plate, alinear motor stator is arranged on the upper surface of the water cooling plate, a linear motor rotor is arranged on the lower surface of the load assembly and drives the load assembly to do reciprocating rectilinear motion, a position signal detection assembly is composed of a grating ruler and a reading head, the grating ruler is arranged on the upper surface of the load assembly, the reading head is fixed on the upper surface of the pedestal and reads a signal of the grating ruler in the movement process of the load assembly, and the reading head and a winding in the linear motor stator areconnected to a controller. The system has the advantages that the problem that the positioning precision of an existing linear motor feeding system is interfered by cables can be solved, the cable-free movement of the load assembly is realized, the operation speed of the system is increased, and the positioning precision of the system is improved.