The invention discloses a reciprocating type 
tidal power generation device. The device comprises a device body, an anchor rod, a driving structure, a floating ball, a pulling 
rope, meshing balls, a transmission wheel, a first rotating shaft, a second rotating shaft, a winding wheel, a rotating structure and an 
electric generator body. The device has the beneficial effects that when the 
sea level rises along with tides, the floating ball located at the top end of the pulling 
rope can play a pulling role on the pulling 
rope through 
buoyancy of 
seawater, the plurality of meshing balls sequentially arranged on the pulling rope at equal intervals can be meshed with the transmission wheel located in the device body, the transmission wheel is driven to rotate while the pulling rope is pulled by the floating ball, the transmission wheel is connected with the 
electric generator body through the first rotating shaft, and the power generation can be achieved through rotation of the transmission wheel; and the other end of the pulling rope is fixedly connected to the winding wheel, and along with retreating of the tides, in cooperation with the rotating structure connected with the other end of the second rotating shaft , the pulling rope is wound by utilizing energy of 
seawater flowing during ebb tide, and meanwhile, the 
electric energy conversion is carried out on energy of ocean currents during ebb tide.