The invention relates to an open-type load cabin for underwater robots, comprising a cabin body and a stay wire driving part. The cabin body consists of a left cabin cover, a right cabin cover, a cabin bottom, a closing stopper, a left opening stopper and a right opening stopper, and the stay wire driving part comprises a stay wire, a sealing bolt, a steering engine and a spring, wherein the cabin bottom comprises a horizontal bottom surface and a perpendicular right vertical surface; the perpendicular right vertical surface is fixed on an underwater robot; the left and right cabin covers with pores all over and the cabin bottom are connected through a hinge and the spring, forming a closed space; the closing stopper is fixed on the cabin bottom for positioning the cabin covers in the closing process; the left and right opening stoppers are arranged on an underwater robot shell for positioning the cabin covers in the process of opening the cabin covers. Two ends of the stay wire are respectively connected with the steering engine and the cabin covers; the middle part of the stay wire, which passes through the underwater robot shell, is sealed through the sealing bolt; the steeringengine is controlled through a control circuit. The load cabin is simple in structure, convenient to control and capable of realizing that the underwater robot carries and releases underwater loads.