The invention relates to an inkjet printing device, in particular to a synchronous double-face digital inkjet printing machine which can realize individual inkjet printing without printing width limitation. The device comprises a wall plate, a cloth takeup and placing device which is arranged on the wall plate, an auxiliary inkjet printing roll with the same diameter as a main inkjet printing roll is alternately arranged with the main inkjet printing roll between the wall plates, and the auxiliary inkjet printing roll is driven by the main inkjet printing roll through a material to be printed; the printing material winds the main inkjet printing roll and the auxiliary inkjet printing roll with the front face and the rear face contacting the main inkjet printing roll and the auxiliary inkjet printing roll respectively, and a bearing plate is arranged below the material to be printed between the inkjet printing rolls; one sides of the main inkjet printing roll and the auxiliary inkjet printing roll are equipped with an upper jet head set and a lower jet head set which can reciprocate and an ink supply larry. The jet head sets can horizontally reciprocate for inkjet printing, can print wide printing materials without limitation by the width of the jet head sets; the material to be printed always wind the inkjet printing rolls at the front printing point and the rear printing point without warping and buckling, and the jet heads get close to the material to be printed; the main inkjet printing roll drives the auxiliary inkjet printing roll, which ensures the inkjet printing precision of the two faces.