The utility model relates to a quant fixed establishment for plastic boat is last belongs to quant fixation technology field, include the vertical screw rod that is provided with, install screw -thread fit's last thread bush with it on the screw rod, wear to be equipped with the sliding sleeve that freely slides from top to bottom on the screw rod, the sliding sleeve lies in the thread bush below,and upward the pot head just is the screw -thread fit connection under the thread bush on the sliding sleeve, sliding sleeve right side level is fixed with the head rod, and the head rod right -handmember is connected with the second connecting rod that the level set up, the vertical sleeve pipe that is fixed with of second connecting rod right -hand member through the universal joint. Through Aquant fixed establishment for plastic boat is last, its simple structure makes things convenient for the upper and lower regulation of quant. During the regulation, only need loosen thread bush and lower thread bush, adjust about carrying out the sliding sleeve and handle, wait to adjust back well, sliding sleeve and screw rod are fixed to thread bush and last thread bush under the rethread.