The invention discloses a labor-saving cable erecting device comprising a seat and a main body arranged at the top of the seat. An air pressure rising and falling device is arranged in the top face ofthe seat. The top of the air pressure rising and falling device is fixedly connected with the bottom face of the main body. First guide rods in sliding fit connection with the main body are arrangedon the parts, on the left side and the right side of the air pressure rising and falling device, of the top face of the seat symmetrically. A sliding cavity is formed in the main body. A first cavityis formed in the part, below the sliding cavity, in the main body. The left side and the right side of the first cavity are provided with a second cavity and a third cavity correspondingly in a mutualcommunicating mode. The second cavity and the third cavity are formed in a downwards extending mode. A first rotary shaft extending up and down is arranged in the sliding cavity. The top extending tail end of the first rotary shaft is in rotary fit connection with the inner top wall of the sliding cavity. The bottom extending section of the first rotary shaft penetrates through the part, betweenthe sliding cavity and the first cavity, of the main body and is in rotary fit connection with the part, between the sliding cavity and the first cavity, of the main body. The labor-saving cable erecting device is simple in structure and convenient to operate, manual operation is reduced, work efficiency of compacting is improved, and the fixing stability of an electric pole is ensured.