The invention relates to a head transmission device of flexible band transporter, used in the transportation of mine well. Wherein, it comprises a chassis and a transmission roller; the left of chassis is fixed with front support; the front support is fixed with protrude support; the right of chassis is fixed with back support; the back support is fixed with back upper beam; the connecting beam is connected between the protrude beam and back upper beam; the connecting beam, back upper beam and protrude bam are connected via connecting pines; the front and back of chassis are independently fixed with roller fixing supports in triangle shape; the upper end of upright support of each roller fixing support is fixed with said connecting beam; the left and right sides of said upright support are independently fixed with corner bearing base; the left and right corner bearing bases are both mounted with transmission roller. The inventive connecting beam can be opened, and the transmission roller can be taken out from it, therefore, the transmission roller can be maintained easily.