终于好了 加了个style
<div id="nav" class="pk-autofull-navigation pk-row">
<div style="padding-left: 217px;"class="pk-container">
<div class="pk-w-md-13 pk-padding-0"> <!--搜索框 长度 位置-->
<form method="get" action="index.php">
<input type="hidden" name="c" value="app" />
<input type="hidden" name="a" value="puyuetian_search:index" />
<div class="pk-row" style="padding-top:{$_G['SET']['TEMPLATE_PUYUETIAN_AUTOFULL_SBOXPTOP']}">
<div class="pk-w-sm-9 pk-padding-0"><!--搜索框 高低位置-->
<input type="search" name="w" class="pk-textbox pk-textbox-noshadow pk-border-right-none pk-radius-top-left-4 pk-radius-bottom-left-4" value="{htmlspecialchars($_GET['w'])}" placeholder="搜索,就是这么简单~" required />
</div>
<div class="pk-w-sm-3 pk-padding-0">
<button type="submit" class="pk-btn pk-btn-block pk-btn-primary pk-radius-bottom-right-4 pk-radius-top-right-4"><span class="fa fa-search"></span></button>
</div>
</div>
</form>
</div>
</div>
</div>