The invention relates to a ship-borne depth finder installation base which comprises a supporting bottom plate. The supporting bottom plate is connected with a ship body through connection assemblies. Guide rods are arranged at the two ends of the supporting bottom plate and fixedly connected with the supporting bottom plate. The guide rods are connected with a fixed base. A supporting rod is arranged at the upper end of the fixed base. A first connection spring and a second connection spring are arranged on the portions, at the upper end and the lower end of the fixed base, of each guide rod respectively. Locking assemblies are arranged at the upper ends of the guide rods. The guide rods, the first connection springs and the second connection springs are arranged, a depth finder is fixed to the supporting rod in this way, and when the ship body fluctuates, vibration of the ship body can be effectively absorbed through the first connection springs and the second connection springs, the influences of vibration on the depth finder are effectively reduced, and the detection precision of the depth finer is ensured.