#!/user/bin/env python3
# -*- coding: utf-8 -*-
from PyQt5 import QtWidgets,QtCore
from PyQt5.QtWidgets import *
from PyQt5.QtCore import Qt
import sys
import time


class RefreshWidget(QWidget):
    def __init__(self,parent=None):
        super(RefreshWidget, self).__init__(parent)

        layout=QVBoxLayout()

        self.label = QLabel()
        self.label.setAlignment(Qt.AlignCenter)

        pushButton = QPushButton("pushButton")
        pushButton.clicked.connect(self.call_back_btn_func)

        layout.addWidget(self.label)
        layout.addWidget(pushButton)

        self.setLayout(layout)
        self.resize(400, 300)

    def call_back_btn_func(self):
        # 刷新1-10
        for i in range(1,11):
            self.label.setText(str(i))
            # 实时刷新
            app.processEvents()
            time.sleep(1)


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    window=RefreshWidget()
    window.show()
    sys.exit(app.exec())

time sleep() 函数推迟调用线程的运行刷新移动窗口有种卡顿的感觉，还是使用线程刷新比较合适

from PyQt5.QtCore import QThread, pyqtSignal, QDateTime, QObject
from PyQt5.QtWidgets import QApplication, QDialog, QLineEdit, QLabel
import time
import sys


class BackendThread(QObject):
    # 通过类成员对象定义信号
    update_date = pyqtSignal(str)

    # 处理业务逻辑
    def run(self):
        while 1:
            # 刷新1-10
            for i in range(1, 11):
                self.update_date.emit(str(i))
                time.sleep(1)


class Window(QDialog):
    def __init__(self):
        QDialog.__init__(self)
        self.setWindowTitle('PyQt 5界面实时更新例子')
        self.resize(400, 100)
        self.input = QLabel(self)
        self.input.resize(400, 100)
        self.initUI()

    def initUI(self):
        # 创建线程
        self.thread = QThread()

        self.backend = BackendThread()
        # 连接信号
        self.backend.update_date.connect(self.handleDisplay)
        self.backend.moveToThread(self.thread)

        # 开始线程
        self.thread.started.connect(self.backend.run)
        self.thread.start()

    # 将当前时间输出到文本框
    def handleDisplay(self, data):
        self.input.setText(data)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = Window()
    win.show()
    sys.exit(app.exec_())

参考：PyQt5 利用线程刷新界面