Disclosed is a compound protecter with a capsule chamber located on the upper part of the protector and two independent sedimentation chambers located on the lower part of the protector, which uses a structure that the capsule chamber is located on the upper part of the protector and two independent sedimentation chambers are located on the lower part of the protector, the protecter is composed of a protector head, a upper capsule chamber, a upper sealing base seat, a middle sedimentation chamber, a lower sealing base seat, a lower sedimentation chamber, a sedimentation guard tube axis, each segment of shells, a through axis and a base. The advantage of the utility model is that: a standard module is used for combination design; a compound third class of protecting three-compartment structure with one capsule chamber located on the upper part of the protector and two independent sedimentation chambers which is located on the lower part of the protector and exert protective effects respectively is used; well fluid and motor oil can be separated to ensure that the motor insulation can not be etched by the well fluid , thus the service life of generating set is prolonged; the utility model with high safety factor, a thrust bearing with large bearing capacity inside the protector, the low cost of the generating set, perfect performance price ratio and very wide market prospects is more suitable to be correlatively used with the motor with big respiratory intensity, and can greatly satisfy the requirement of customers at home and abroad.