An ocean wave force monitoring device disclosed by the present invention belongs to the signal monitoring technology field, and comprises a buoyancy column, a guiding rod, a sealing head, a sleeve, adrying agent, a fixing support, a connecting clamp, an elastic film, a strain gauge, a signal line, an A/D converter and a water storage tank. When the ocean waves pass the buoyancy column, and underthe action of the buoyancy, the buoyancy column drives the guiding rod to move up and down in a sliding cavity and further drives the elastic film connected at the bottom to telescope. According to the ocean wave force monitoring device provided by the present invention, the strain gauge on the elastic film real-timely outputs the strain signals of the elastic film, and the A/D convert converts anelectric signal into a digital signal to transmit to the monitoring device. Moreover, the ocean wave force monitoring device provided by the present invention is convenient to install, is strong in structure reliability and high in sensitivity, can adapt to the complex ocean environments, can monitor the ocean wave environments, and provides the good monitoring means for the ocean engineering construction.