The invention belongs to the field of buildings and particularly relates to a beam plate formwork system for water concrete pouring. The beam plate formwork system comprises a formwork shell base bodyarranged on a formwork support, and the formwork shell base body comprises beam side formworks, a beam bottom formwork and floor formworks, wherein the beam side formworks and the beam bottom formwork constitute a crossbeam formwork shell, the floor formworks are arranged at the upper ends of the beam side formworks, a set of back arrises is arranged on the outer side of each of the beam side formworks, the beam bottom formwork and the floor formworks, a set of reinforcing devices is arranged on the outer side of the crossbeam formwork shell, and a set of connecting part shaped like a Chinesecharacter 'Shan' is arranged on each of horizontal internal corners constituted by the floor formworks and the beam side formworks. Compared with the prior art, the beam plate formwork system has thebeneficial effects that 1, the formworks are doubly reinforced through jaw reinforcing parts and bayonet reinforcing parts, the reinforcing effect is good, demounting and mounting are convenient, andthe formworks are not damaged; and 2, the vertically fixed formworks are connected through the connecting parts shaped like the Chinese character 'Shan' and two-in-one screws, the reliability of connection between the formworks can be ensured, operation is convenient and rapid, the time and labor are saved, and the beam plate formwork system is quite practical.