可能是你忘记了密码；帐号输入有误；没有区分字母大小写；未开启小键盘、键盘坏了，漏输了数字或字母；也有可能之前修改密码是没有成功。
也有可能是电脑中了木马病毒，显示你的密码错误，或者盗取了你的QQ账号。
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修改QQ密码的具体步骤如下：
一、打开QQ面板，在左下角找到三条杠的图标并点击。
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二、打开主菜单，选择【设置】选项，并点击鼠标左键，进入【设置】面板。
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三、在【设置】面板中，找到【安全设置】，并点击鼠标左键进入。
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四、进入【安全设置】界面，找到【修改密码】界面，并点击鼠标左键进入。
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五、完成上步后，电脑自动弹出QQ安全中心的网页，要求你填写完整的绑定的密保手机号。
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六、填写完成后，系统会自动给你的手机发送验证码，把该验证码填入下方。
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七、完成上步后，设置新密码，两边密码一致后，点击确定键则完成修改。
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