The invention discloses a heat radiator water chamber with an internally-installed reinforcing rib structure and a heat radiator core, and belongs to the technical field of heat radiators. The problems that in the prior art, the arrangement number of reinforcing ribs in a traditional heat radiator water chamber is large, water flow in the heat radiator water chamber is influenced, water resistanceis increased, the heat radiator water chamber is in the high temperature environment for a long time, the strength of the heat radiator water chamber is insufficient, and water is prone to being leaked are solved. According to the adopted technical scheme, the heat radiator water chamber comprises a heat radiator water chamber body and reinforcing ribs; the reinforcing ribs comprise the reinforcing ribs I and the reinforcing ribs II; the multiple reinforcing ribs I are fixedly arranged at the two ends of the inner wall of the heat radiator water chamber body; the multiple reinforcing ribs IIare fixedly arranged on the two sides of the center of the inner wall of the heat radiator water chamber body; and the heat radiator water chamber is simple in structural design, forming is convenient, the strength of the heat radiator water chamber can be effectively improved, the water resistance in the heat radiator water chamber can be reduced, and the heat radiation capacity can be improved.