The invention discloses an opening-closing force performance and state monitoring device of a double-linked cable hydraulic steel gate. The monitoring device comprises a connecting rod. Pulleys are arranged at the two ends of the connecting rod respectively and are in transmission connection with the connecting rod respectively. Besides, a stress measuring sensor is also arranged at the connectingrod and is used for detecting the axial tensile force on the connecting rod based on the deformation degree of the connecting rod. Two ends of a rope for lifting the gate wind around the two pulleys;and flexural deflection is made by using the pulleys as fulcrums. Besides, the monitoring device also includes an angle measuring device for measuring the flexural deformation angle of the rope; andan opening-closing force of the gate is calculated based on the flexural deformation angle of the rope and the axial tensile force on the connecting rod. The monitoring device having advantages of simple structure and high practicability meets the requirements of modern water conservancy development; the practicability and efficiency of the traditional steel gate can be improved; and thus the multidimensional digitization of the opening-closing force monitoring data of the cable hydraulic steel gate is realized and the safe operation of the hydraulic steel gate is guaranteed effectively.