The present invention discloses a transverse-flux magnetic field modulation type linear motor. The transverse-flux magnetic field modulation type linear motor comprises a primary side and a secondary side; the secondary side comprises secondary iron cores and permanent magnets; the two secondary iron cores are C-shaped and are arranged in a mirror-image manner; the permanent magnets are evenly distributed on three surfaces of the inner side of each secondary iron core; a three-surface air gap exists between the primary side and the secondary side; the primary side includes two identical primary iron cores and a connection beam which is connected with the two primary iron cores; a plurality of identical salient pole teeth are equidistantly distributed on each of the upper surfaces and lower surfaces of the primary iron cores and opposite surfaces of the connection beam; equidistant dummy teeth are formed in ends of the salient pole teeth which are adjacent to the air gap; the width of the dummy teeth is equal to the width of dummy slots between the dummy teeth; the salient pole teeth are wound with armature windings; three phases of the primary side are wound with three-phase armature windings respectively; and the number of the dummy teeth is equal to the sum of the number of the pole-pairs of the permanent teeth and the number of the pole-pairs of the armature windings. According to the transverse-flux magnetic field modulation type linear motor of the invention, the dummy teeth can great facilitate the adjustment of a magnetic flux loop, so that useful harmonic waves are greatly improved.