A compact twin-shaft bobbin structure comprising: a first bobbin including a penetrating first center through-hole and a first winding slot group having a plurality of adjacent first winding slots on the outer peripheral side of the first bobbin around said first center through-hole, a laterally extending first receiving recess formed at one end of the first center through-hole, a first pin group including a plurality of pins and an opening provided on two ends of the first receiving recess, respectively; a second bobbin including a penetrating second center through-hole, a second winding slot group having a plurality of adjacent second winding slots and two clamping slots on the outer peripheral side of the second bobbin around said second center through-hole, a laterally extending second receiving recess formed at one end of the second center through-hole, and a second pin group including a plurality of pins and an opening provided on two ends of the second receiving recess, respectively, wherein: when the first and second bobbins (1, 2) are joined together, the first and second receiving recesses (16, 26) are in communication with each other, while the first and second center through-holes (11, 21) extend in parallel to each other with the first and second pin groups (15, 25) arranged at the outer sides of the joined bobbins (1, 2), respectively, characterized in that a shield in the shape of an "n" is provided on one side of the second bobbin between the first and the second bobbin (1, 2), the shield further includes inwardly bent flanges along two edges thereof, the two flanges are inserted into the two clamping slots, respectively, to fasten the shield to the second bobbin, wherein the two clamping slots are provided on the top and bottom of the second winding slot group, respectively. a first bobbin including a penetrating first center through-hole and a first winding slot group having a plurality of adjacent first winding slots on the outer peripheral side of the first bobbin around said first center through-hole, a laterally extending first receiving recess formed at one end of the first center through-hole, a first pin group including a plurality of pins and an opening provided on two ends of the first receiving recess, respectively; a second bobbin including a penetrating second center through-hole, a second winding slot group having a plurality of adjacent second winding slots and two clamping slots on the outer peripheral side of the second bobbin around said second center through-hole, a laterally extending second receiving recess formed at one end of the second center through-hole, and a second pin group including a plurality of pins and an opening provided on two ends of the second receiving recess, respectively, wherein: when the first and second bobbins (1, 2) are joined together, the first and second receiving recesses (16, 26) are in communication with each other, while the first and second center through-holes (11, 21) extend in parallel to each other with the first and second pin groups (15, 25) arranged at the outer sides of the joined bobbins (1, 2), respectively, characterized in that a shield in the shape of an "n" is provided on one side of the second bobbin between the first and the second bobbin (1, 2), the shield further includes inwardly bent flanges along two edges thereof, the two flanges are inserted into the two clamping slots, respectively, to fasten the shield to the second bobbin, wherein the two clamping slots are provided on the top and bottom of the second winding slot group, respectively. when the first and second bobbins (1, 2) are joined together, the first and second receiving recesses (16, 26) are in communication with each other, while the first and second center through-holes (11, 21) extend in parallel to each other with the first and second pin groups (15, 25) arranged at the outer sides of the joined bobbins (1, 2), respectively, characterized in that a shield in the shape of an "n" is provided on one side of the second bobbin between the first and the second bobbin (1, 2), the shield further includes inwardly bent flanges along two edges thereof, the two flanges are inserted into the two clamping slots, respectively, to fasten the shield to the second bobbin, wherein the two clamping slots are provided on the top and bottom of the second winding slot group, respectively.