The invention provides a back contact heterojunction solar cell. The back contact heterojunction solar cell comprises an ITO conducting film, a doped amorphous silicon film, a P-type amorphous silicon film, an N-type silicon substrate, an N-type amorphous silicon layer film, the doped amorphous silicon film and the ITO conducting film, which are sequentially stacked from top to bottom, wherein front conducting grid lines are printed on the upper surface of the ITO conducting film at the upper layer; back conducting grid lines are printed on the lower surface of the ITO conducting film at the lower layer; packaging points are printed on the back conducting grid lines; insulated coatings coat two sides of the solar cell; a conductive adhesive layer is arranged outside each insulated coating and is in contact with the front conducting grid lines; and each conductive adhesive layer is isolated from the back conducting grid lines by an insulating groove. The conductive adhesive layers coat the periphery of the cell; front electrodes of the cell are led to the back surface; the fabrication technology is simple; and a short circuit caused by punching is avoided. The front electrodes of the cell can only be led out from two sides through the conductive adhesive layers, so that the contact probability of back electrodes and the front electrodes is low in package, namely the short circuit is not easily caused in package.